Position Lost Alarm



My TZtouch and GP 330B has on two separate occasions given me a position lost signal when switched on. The first (about two months ago) was rectified by switching the network off/on once, but on the second occasion it required multiple off/on operations to get rid of it. Satellite reception when tested on a hand held gps was good on both occasions.Could you advise as to what could be causing this problem ?
You might scan the forum threads about discussions about having your GPS antenna mounted too close to other RF items and/or within the radar beam. If you can't determine why it keeps getting lost, you might want to contact your local dealer for service.