Frequent reboot of R10

[panchopantera]

After 1.5yrs of flawless service, my R10 has reebooted itself at least 4 times in the past 2 days (and that's just the ones I notice...). Also, I'm experiencing picture problems mostly on the 500 channles just as if there was rain or clowds, but the sun is shinning... this is only sometimes but today was on most 500 movie channels....
Any ideas on these issues??
Thanks..