Market Download Problems

I have recently started getting problems downloading from the Market on my Xoom. My first issue started with Xfinity TV App. That one would download to 75% and then freeze every time and proclaim Invalid Package File. So after clearing out the Cache and trying to Delete All Data associated with the Market App I have had no luck. So I gave up and now it is happening again but this time with a Panasonic Viera App. So now I am frustrated and want to fix this. Any ideas?