My Blackberry torch bolt sign on the charging bar keeps on disappearing and re-appearing when I'm charging it if I'm using it while charging. It gets fairly hot so is it due to that? I noticed it charges fine if I leave it alone aside. Has anyone else had this problem?

All I can find on this is that lithium batteries won't charge if they're overheated and my phone does get fairly hot when I use it a lot. Just wondering if this is a common Torch problem because I didnt have it with my Bold.