Recently my 510 has decided to delete the entire record schedule, multiple and single events. The hard drive is nowhere near full and a hard reset has not fixed it.
510, 508 dvr's are junk! sorry, they have been out dated for close to 5 years.
the drive is probably going bad, that was there or is there issue's. you can probably upgrade to a 625 for $50-$75???? i dont know, but a 625 dvr will record 2 shows at once or watch 1, record 1.
call dish and you "may" be eligle for an upgrade