Apologies for raising an old question, I know this has been covered in the past.

Did anyone ever reach a definitive conclusion as to what was causing the issue with the Treo missing incoming cals and SMS?

From what I can see searching the old threads it appears to have been possibly linked to certain applications being installed. I've been affected by the problem a couple of times lately. The first time a soft reset appeared to resolve it.

Last night I sorted it without a reset by simply switching the wireless mode off and on again, forcing it to reconnect to the network. As soon as the network connection was back up I received the missing SMS messages. I am assuming from this that the problem I'm experiencing is to do with the network connection rather than some application intercepting incoming calls. I'm only using GPRS intermittently at the moment and wasn't connected last night when the problem occurred.

Any suggestoins much appreciated.