I had two 508 receivers that constantly re-booted. The units were replaced by two new 510 units with virtually the same problem. Those two units were again replaced with two remanuf 510's with again the same problem. Based on info received from an on site field supervisor I upgraded to two 510 receivers. Foolish me. The upgrade was free but had to agree to 18 month commitment. I later found out that the 508, 510, 522 receivers all had the same software problem. It is a power supply issue and Dish Network does not know when, if ever, it will be resolved. I intend to write to Dish Network, 9601 Meridian Blvd., Englewood, Colorado, 80112, attn: Executive Team in hopes of, but don't expect, some type of resolvement. If anyone out there in satellite land has issues of this type, kindly post.