Re: Big name no guarantee
I've never had a flawless in-place upgrade on a Droid yet.
However, backing up and doing a factory reset after updating usually is enough to sort most quirks out - other than that, head to the XDA forum for a better device support experience and possibly some bug fixes for the problems that you are having...
http://forum.xda-developers.com/showthread.php?t=2609964