Share your experience!
Settings-apps-all-phone,force stop and clear data.Restart and check again.
I had the same problem.
My city does not have 4G except in a couple of areas...and i was loosing my signal. so...in call settings I put prefferd 4G, but use 3G if 4 is not available. then cleared cache, and worked fine since then.
Cache for the entire device. But it won't help as you already repaired with PCC. Did you restore any apps?
The only sheet thats there is the one that came with the phone.. and it doesnt misbehave anywhere else.. so it cant be the touch screen issue, and i didnt restore any apps, i started from scratch