i have experienced these same problems.some things that i did just before they occurred were turning on a fluorescent light, and or operating the remote control garage door opener . have not determined if these are factors or just coincidences and they have not always occurred. 508 is 2 weeks old bought new. this also occurred once i recorded greetings from Tuscon a new show which was also available in Spanish. halfway through program they were speaking English and Spanish at the same time went on for about 5 min. then went to just English. this was probably a problem from the station ktla at least i hope so.