Same problem here. Not only push notifications but lagging and timeouts in Foursquare, Instagram and Gamecentre. Strangely Internet access via 3G is fine (tested on Safari on iPhone). Also only certain areas seem to be affected, as I did not experience any problem in Subang and Klang but had problems at Aman Suria and Kelana Jaya.

Hi guys, the problem with Maxis seems to be location based. So far I've heard complaints from users in Kelana Jaya, Aman Suria, Kota Damansara, Cyberjaya (!) and Kepong. No problems in KL and Subang.

Looks like the problem is not limited to Klang Valley though. My guess is certain IPs ranges are having routing issues.

I have reported it to Maxis last Sunday. I suggest that everyone facing the problem does the same, at the very least Maxis will know that this issue is affecting quite a number of users.

Update on the Maxis issue, got a call from Maxis tech support yesterday and they are aware of it (basically admitting yeah we have a problem). However they are 'unsure of the cause and are still investigating'.