I didn’t read this question, sorry Zeus,
Yes, it points to a frequency problem. In RNO, can you check which TRX are carrying most of Erlang TCH ? Also, if you’re in B10, you can check the number of PDCH allocation per TRX (can’t you?).
So this could help you find out which TRX could be the problem. Are you using SFH, BBH or NH? If SFH, then it looks like your BCCH is clean but the MA list used on the other TRX’s is a very dirty one.
A popular saying: “If only my wife was as dirty as your TRX…”