PPCGeeks - portrait mode

this is strange and i'm guessing it's hardware.. bout a week ago i got the 3.5 framework and i'm not sure if this even has anything to do with it but... phone started acting weird. shortly b4 the bottom corner had cracked i slid it open one time and a piece of the side of my phone bout 1/4 inch wide came off..strange :( anywho bout 3 days ago phone started acting kinda sluggish when i'd go back to portrait mode. yesterday i noticed it wouldn't change from landscape back to portrait when closed. but if slid back open it would show portrait mode right b4 changing to landscape mode. if i turn off phone and turn on in portrait it's a blank screen. if i wanna see screen i have to tap power button change to landscape and tap again to see screen. Tried hard resetting didnt fix? hardware? also it's been just over a year (like a week maaybe) since i got the phone think i can get it fixed or no?