diff --git a/src/components/display/Dropdown.tsx b/src/components/display/Dropdown.tsx
index 316108b6..6c1fa478 100644
--- a/src/components/display/Dropdown.tsx
+++ b/src/components/display/Dropdown.tsx
@@ -23,7 +23,7 @@ import {
 	StrictModifiers,
 	VirtualElement
 } from '@popperjs/core';
-import { find } from 'lodash';
+import { find, forEach } from 'lodash';
 import styled, { css, SimpleInterpolation } from 'styled-components';
 import { pseudoClasses } from '../../theme/theme-utils';
 import { Padding } from '../layout/Padding';
@@ -402,6 +402,15 @@ const Dropdown = React.forwardRef<HTMLDivElement, DropdownProps>(function Dropdo
 	const endSentinelRef = useRef<HTMLDivElement | null>(null);
 	const [position, setPosition] = useState<VirtualElement | null>(null);
 	const [currentHover, setCurrentHover] = useState<string | null>(null);
+	const openPopperTimoutRef = useRef<ReturnType<typeof setTimeout>>();
+
+	useEffect(
+		// clear timers on unmount
+		() => (): void => {
+			openPopperTimoutRef.current && clearTimeout(openPopperTimoutRef.current);
+		},
+		[]
+	);
 
 	useEffect(() => {
 		setOpen(forceOpen);
@@ -461,7 +470,7 @@ const Dropdown = React.forwardRef<HTMLDivElement, DropdownProps>(function Dropdo
 				})
 			};
 			setPosition(virtualElement);
-			setTimeout(() => {
+			openPopperTimoutRef.current = setTimeout(() => {
 				if (!disabled && !openRef.current) {
 					openPopper();
 				}
@@ -555,36 +564,40 @@ const Dropdown = React.forwardRef<HTMLDivElement, DropdownProps>(function Dropdo
 	}, [open, placement, contextMenu, position, dropdownRef, innerTriggerRef]);
 
 	useEffect(() => {
-		if (!disableAutoFocus) {
-			open &&
-				setTimeout(() => {
-					const selectedItems = dropdownRef.current
-						? dropdownRef.current.querySelectorAll<HTMLElement>('.zapp-selected')
-						: [];
-					selectedItems.length > 0
-						? selectedItems[0].focus()
-						: popperItemsRef.current &&
-						  popperItemsRef.current.children[0] &&
-						  popperItemsRef.current.children[0] instanceof HTMLElement &&
-						  popperItemsRef.current.children[0].focus();
-				}, 1);
+		let timeout: ReturnType<typeof setTimeout>;
+		if (!disableAutoFocus && open) {
+			timeout = setTimeout(() => {
+				const selectedItems = dropdownRef.current
+					? dropdownRef.current.querySelectorAll<HTMLElement>('.zapp-selected')
+					: [];
+				selectedItems.length > 0
+					? selectedItems[0].focus()
+					: popperItemsRef.current &&
+					  popperItemsRef.current.children[0] &&
+					  popperItemsRef.current.children[0] instanceof HTMLElement &&
+					  popperItemsRef.current.children[0].focus();
+			}, 1);
 		}
+
+		return (): void => {
+			timeout && clearTimeout(timeout);
+		};
 	}, [disableAutoFocus, dropdownRef, open]);
 
 	useEffect(() => {
 		openRef.current = open;
+		let timeout: ReturnType<typeof setTimeout>;
 		if (open) {
-			setTimeout(() => windowObj.document.addEventListener('click', clickOutsidePopper, true), 1);
-			contextMenu &&
-				setTimeout(
-					() => windowObj.document.addEventListener('contextmenu', clickOutsidePopper, true),
-					1
-				);
+			timeout = setTimeout(() => {
+				windowObj.document.addEventListener('click', clickOutsidePopper, true);
+				contextMenu && windowObj.document.addEventListener('contextmenu', clickOutsidePopper, true);
+			}, 1);
 		}
 
 		return (): void => {
 			windowObj.document.removeEventListener('click', clickOutsidePopper, true);
 			windowObj.document.removeEventListener('contextmenu', clickOutsidePopper, true);
+			timeout && clearTimeout(timeout);
 		};
 	}, [open, closePopper, clickOutsidePopper, contextMenu, windowObj.document]);
 
diff --git a/src/components/display/Tooltip.tsx b/src/components/display/Tooltip.tsx
index 4f2254cf..d09ba616 100644
--- a/src/components/display/Tooltip.tsx
+++ b/src/components/display/Tooltip.tsx
@@ -147,7 +147,7 @@ const Tooltip = React.forwardRef<HTMLDivElement, TooltipProps>(function TooltipF
 
 	useEffect(() => {
 		// Added timeout to fix Preact weird bug
-		setTimeout(() => {
+		const timeout = setTimeout(() => {
 			if (triggerRef.current && !disabled) {
 				triggerRef.current.addEventListener('focus', showTooltip);
 				triggerRef.current.addEventListener('blur', hideTooltip);
@@ -163,6 +163,7 @@ const Tooltip = React.forwardRef<HTMLDivElement, TooltipProps>(function TooltipF
 				refSave.removeEventListener('mouseenter', showTooltip);
 				refSave.removeEventListener('mouseleave', hideTooltip);
 			}
+			clearTimeout(timeout);
 		};
 	}, [triggerRef, showTooltip, hideTooltip, disabled]);
 
diff --git a/src/components/feedback/CustomModal.tsx b/src/components/feedback/CustomModal.tsx
index 78b3a883..8b0175a3 100644
--- a/src/components/feedback/CustomModal.tsx
+++ b/src/components/feedback/CustomModal.tsx
@@ -126,7 +126,10 @@ const CustomModal = React.forwardRef<HTMLDivElement, CustomModalProps>(function
 	}, [open, onStartSentinelFocus, onEndSentinelFocus, windowObj]);
 
 	useEffect(() => {
-		setTimeout(() => setDelayedOpen(open), 1);
+		const timeout = setTimeout(() => setDelayedOpen(open), 1);
+		return (): void => {
+			clearTimeout(timeout);
+		};
 	}, [open]);
 
 	const modalWrapperClickHandler = useCallback<React.MouseEventHandler>((e) => {
diff --git a/src/components/feedback/Modal.tsx b/src/components/feedback/Modal.tsx
index 677fb3d9..369c71a8 100644
--- a/src/components/feedback/Modal.tsx
+++ b/src/components/feedback/Modal.tsx
@@ -349,7 +349,11 @@ const Modal = React.forwardRef<HTMLDivElement, ModalProps>(function ModalFn(
 	}, [open, onStartSentinelFocus, onEndSentinelFocus, windowObj]);
 
 	useEffect(() => {
-		setTimeout(() => setDelayedOpen(open), 1);
+		const timeout = setTimeout(() => setDelayedOpen(open), 1);
+
+		return (): void => {
+			clearTimeout(timeout);
+		};
 	}, [open]);
 
 	return (
diff --git a/src/components/utilities/Transition.tsx b/src/components/utilities/Transition.tsx
index f045128a..0f600315 100644
--- a/src/components/utilities/Transition.tsx
+++ b/src/components/utilities/Transition.tsx
@@ -191,7 +191,7 @@ const TransitionOn = React.forwardRef<HTMLElement, TransitionOnProps>(function T
 			};
 		}
 
-		setTimeout(() => {
+		const applyStyleTimeout = setTimeout(() => {
 			if (childElement) {
 				const fromStyles = from || STYLES[type].from;
 				applyStyle(fromStyles, childElement);
@@ -199,7 +199,7 @@ const TransitionOn = React.forwardRef<HTMLElement, TransitionOnProps>(function T
 			}
 		}, 1);
 
-		const timeout = setTimeout(() => {
+		const resetStyleTimeout = setTimeout(() => {
 			if (childElement) {
 				childElement.style.transition = '';
 				const endStyles = end || STYLES[type].end || {};
@@ -208,7 +208,8 @@ const TransitionOn = React.forwardRef<HTMLElement, TransitionOnProps>(function T
 		}, duration);
 
 		return (): void => {
-			clearTimeout(timeout);
+			clearTimeout(applyStyleTimeout);
+			clearTimeout(resetStyleTimeout);
 		};
 	}, [
 		apply,