hi guys, want to ask about iPhone 6, my gf is using one, previously the screen was cracked, and battery had some problem, so those were repaired.

Since few months back, my gf's touch screen seem to be working sometimes, and other times, it wouldn't register the touches. Turning off the screen and turning it back on helps, but the touch issue seem to be coming and going from time to time. I didnt notice a grey flickering bar, so I'm not too sure if I can conclude that this is the touch IC failing just yet.

Another problem is similar to soyabean123, i ran into some performance problem, and the battery to be failing, sometimes battery can drop from 50+ to like 15% straight. I replaced the battery with a decent 3rd party brand. Battery life problem is solved, but seems like performance wise is similar. I'm waiting for 11.3 for the function to come to see if i can fix it by disabling that throttling 'feature', until then, can other experienced user advice me on how to monitor the performance, like maybe capturing CPU clockspeed etc to just investigate exactly what is wrong, or if anyone has faced this before and manage to solve it?

hmm ok, thanks for the info.

for IP6's case, i only suspect 2 things, first is the throttle for older phone, to kinda force user to change to their latest product, 2nd would be that later iOS becomes heavier and IP6 CPU cant handle that.

although i did read somewhere, not sure if i misunderstood, that apple's custom core design has a somewhat heavy performance deterioration over time, so after 1 year+ of usage you can already feel the phone getting slower, since it can no longer have the peak performance that it used to get, and is sustaining itself with a lower clockspeed for stability.