It may be a problem with the rom itself so try and flash another rom or reflash the one you are currently using. Just remember to backup your info and wipe/factory reset then flash
Try androidspin.com's release matrix have plenty of Roms there just choose your phone choose 2.2 and you should be ready to go.
I would recommend trying a CyanogenMod based rom, as I have run CM on many htc devices (including my old eris) and have experienced excellent stability, as well as great features.
