A lot of trunk system administrators periodically change the control channel inorder to give repeaters a rest. Granted Simi is not on a trunk sys but that could be the reason or maybe channel 1 is BO and awaiting parts from mother M.
something is definitely up. Went to get some Pastrami at The Hat for lunch (Brought my Scanner with me) and saw a SVP unit pull over someone down the street and did not hear anything at all for 15 minutes while I was ordering and getting my food which took about 10-15m.
Got back in the Car and had the scanner ON the whole way back home to Chatsworth and scanned nothing.