Question APN not connecting after 6 - 12 hrs

Hi guys, I am not sure if anyone else has experienced this before, I have done a bit of searching.

If I connect my data connection (APN) at night it will work fine, if I disconnect it, go to bed, then wake in the morning and try to reconnect the APN , it will fail. The only solution is to turn on airplane mode, then disable it, then reconnect my data (APN).

I have updated to the latest (leaked) radio, hoping that this might have fixed the problem, but its still happening. It's been happening ever since I bought the phone, on stock ROM, and on every other ROM I have tried (2.1 and 2.2).

Has anyone else seen this? Is it related to my carrier (Optus)?

It just seems that it wont reconnect if it hasnt been used for 6+ hours...

Please Help
ROM: Changes too often
Phone: Diamond -> iPhone3GS -> Touch Pro -> Desire -> iPhone4 -> Transformer Prime -> DesireHD -> HTC One X -> Galaxy Note 2 4G + Nexus 7