I had this problem w/ .83... I did a wipe and reinstalled .83 which didn't help.
I think what finally fixed it was removing a browser channel (accuweather).
It was locking up like that daily, but when I removed the channel it didn't lock up for at least 24 hours... then I upgraded to .85 yesterday and it still hasn't happened (and I haven't added the accuweather service back).
It could still be a lurking problem, it was random enough not to know it's truly "fixed"... but this could help...
I am running a pretty stripped phone though - only a couple apps and no Application Center which I found to be useless...
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