Inconsistent response from eth_call RPC API

[erc20-exchange]

Here is the problem I see: RPC response for the same eth_call is inconsistent. I was not able to figure out why, but sometimes it succeeds and returns data needed and sometimes it returns "0x" as a response. This may depend on a load of node or something else, but behavior is totally inconsistent.

System information

Geth version:
Version: 1.8.14-stable
Git Commit: 316fc7e
Architecture: amd64
Protocol Versions: [63 62]
Network Id: 1
Go Version: go1.10.3
Operating System: linux
GOPATH=
GOROOT=/home/travis/.gimme/versions/go1.10.3.linux.amd64

OS & Version: Linux ip-172-31-44-203 4.4.0-1061-aws #70-Ubuntu SMP Fri May 25 21:47:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Expected behaviour

Consistent response from eth_call RPC with data from a contract.

Actual behaviour

Sometimes data is returned with no problems (and data is correct), sometimes I get "0x" as a response. Also, whenever I try the same function call in MEW it works just fine. Also, I've notes that if I request less data from a contract the function becomes more stable in returning the data, but stil have chances to fail.

Interface of the contract function

function get_balances(address a, uint32 offset, uint32 count) constant returns (uint256, uint256, uint256[], uint256[])

Steps to reproduce the behaviour

curl :8545 -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"from": "<your_account>", "to": "0xa5B206F9832f9B90652AdFC6c336792bBd1883a0", "data": "0xcb3fe695000000000000000000000000e450743e5f213bb32b0c3f4c7b9732b51e3c702e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000064"}, "latest"],"id":1}'

which is equivalent of get_balances(0xe450743e5f213bb32b0c3f4c7b9732b51e3c702e, 0, 100);

[stale]

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