Galaxy S4 I9500 Lag - Galaxy S 4 Q&A, Help & Troubleshooting

Hello.
Recently i was in Prism BB v16 and had no lags at all (11GB pit), but yesterday i tried to go back to Stock Lollipop (with 8gb pit) and i tried both HOA7 and the new HOD4 firmware, and they both were extremely laggy. I couldn't install almost any apps, camera wouldn't work, when i lock the phone and try to wake the phone it took 30+ seconds to show the lockscreen. And btw all the roms i try lag like this now (Aurora S6 port, Prism BB etc..)
Now i'm back to stock 4.4.2 UGNJ1 and it's working as it did before with the only problem being when taking 4-5 HDR photos, phone shuts down itself and the only way to turn it on is by taking out the battery.
I've flashed alot of Custom Roms (100+) in the past but never experienced any similar problem until now.
What could be the problem ?

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[Q] LED Flash Lagging with Applications

Hi all,
I bought a Samsung GT I9500 and I noticed that whenever I put an application such as an LED Flash Light or LED Flash Notifications (like flash blink) for some reason or other it slows the whole phone down it practically freezes up entirely and after a long wait the flash finally comes on. This only happens the first time if I was to put the flash off and on continuously it would be a bit snappier but would still be noticeably lagging. This doesnt happen with the camera btw when taking pictures the flash works just fine. It only seems to be occuring like this when another application is involved.
The phone is still under warranty do you think I should ask for a change of phone or do you think its a ROM issue? Although it is occuring with both stock and modified roms (im using WANAM rom).
Thanks
I work nights so I rely on the torch in my phone for all kinds of things. The SOLE reason why I cant use custom kernals is my ultra bright torch app crashes on anything but stock kernal.
This is your answer - flash the repackaged stock kernal from Wanam and it should be much better. I had the exact problem you did an now its fine.
Hi thanks for your reply,
I reflashed the repackaged kernel but the flash blink application keeps lagging or in some cases it doesn't flash at all probably because it takes too long for the flash to start up only the camera application works flawlessly with the flash so far. Any other suggestions guys? Or perhaps a problem with the handset?

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A few months ago, I flashed a 6.0.1 cyanogenmod rom(by Alberto96) onto my jfltexx(international) S4. Excellent Rom I must say, but since that flashing, my phone had been dying at 30%, (when I switch on the screen if its 30% or below it'd freeze then switch off). Thinking the ROM was the issue, I then reverted back to stock Samsung 5.0.1, but the issue persisted. I'm not a fan of the stock rom and would like to go back to CM or lineage, any idea what could be causing it?
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Regards

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