I'm sorry to hear that
@asantaga &
@fanfzero - sounds like your i9505 has a lower grade PVS0 or PVS1 chip.
(I have a PVS2 which is what over 90% of the i9505's came out with.
Most of the users (who have normal phone usage requirements) are using my settings & didn't report any such issues so far - possibly as we all have a PVS2 (or better) chip
I have gone 3 weeks now without a single forced reboot. (touchwood)
I would suggest your first download my sTweaks "default settings" as they are all edited accordingly.
Please add +25mV to all voltages to see if its stable - (then it means you have a PVS1)
If the black lines still occur add another 25mV to each setting (means you have a PVS0) & keep the GPU voltages stock.
Comparing apples to bananas doesn't make sense as
@_Bon_Bon's sTweaks are not running on the same principles as mine so he can't undervolt AND increase load at the same time & expect stability.
You would need to decide & use just one set of tweaks - your car would either run on Petrol or Diesel - not both :good:
See these screenshots - Multitasking + running AnTuTu (Stress test) & phone is stable @ just 62C - also does my battery life look good to you?
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