I must say HTC have some hardware issues with their phones. I had 2 Evo 3D. The 1st one had a speaker problem and I returned it, the 2nd one has a screen problem. I've read other people had other issues with their phones too. Their software is OK
After having a number of htc phones fail on me right in a row, one failed and the subsequent replacements all failed with in the 30 day replacement warranty that each one had until the last one made it to 35 days before failing and i was done with htc. I've convinced more than a few people to stay away from htc. Nothing to do with the os, it was a junk phone from a junk manufacturer