Phone freezes - battery pull-out needed

[zgaspar]

I'm on Inew V3 850/2100 version with cxq_v3_inew_v1.0.4 for 7 months and until few days phone worked almost as advertised.
It had some hickups like:
- gps precision is garbage - like +/-40 m (i can live without it)
- phone locks screen when switches from H+ to edge (can be really annoying...)
- battery life is prety poor

I bought THL W8 battery and did mod like described here on forum, and everything worked well. After day or two on THL battery phone started to not wake from stand by. At first i thought that this is some kind of problem with
THL battery so I switched back to original Inew.

Same thing. Problem is elusive and manifest in many different ways....
Problem manifest several times a day usualy when battery percentage is at least 70% but it tends to happen more frequent on lower percentages. Usually phone does not awake from stand by. Sometimes it will just light capacitive buttons and stop, other times it will make only 2x vibration on any mech. key press...
Sometimes it will receive phone call but get stuck with unresponsive touchscreen...

However one thing is common for all cases ... i have to pull out battery, sometimes even 2X to power on phone again. Sometimes it needs two preses of power button to get started?

On few occasions phone would slow down and after a while started to pop up errors like:
settings stopped to work or
...gapp stopped to work

I never noticed problems when on charger or USB...

I tried battery calibration, cleaned cash through recovery but without result.
Probably will try kit kat rom (which one would you recommend?)...

Did someone noticed something similar?