Push email (MS exchange) works intermittently after upgrade to ios 5.1 and ios 5.1.1

I have an iphone 4 with my office email (MS exchange) account configured. Other accounts are Gmail & iCloud.
Office email is configured as Push, Gmail as Fetch and iCloud as Push.
Till ios 5.0.x everything was fine. Office emails were getting pushed and there were no issues.
However after upgrading/restore to ios 5.1 & then 5.1.1 push email mostly does not work.
Few observations :
1. Push email works fine when I am at home on wi-fi.
2. When I leave home for work (therefore on 3G), mails stop getting pushed. Sometimes they get pushed for a period of 1 to 2 hours. Then they stop
3. Manually fetching office mails also does not work
4. Strangle accessing the office webmail site in Safari https://mail.xxxxx.com does NOT work. While i can load other sites in safari, the mail site does not load.
5. In office sometimes in the lift phone switches from 3G to Edge or no signal and then when out of the lift, suddenly mails get pushed, but then stop after some time.
6. Moment I get onto wi-fi, push emails start working
7. There is no issue with accessing gmail.
8. Other push notifications work (gmail app, facebook notifications etc)
9. There have been no changes to our MS exchange server
10. I have tried the usual stuff of resetting network settings, rebooting the phone, killing the mail app, going to airplane mode, deleting the mail a/c and recreating etc etc. But no luck.
Apart from upgrading/restoring to 5.1 and then 5.1.1, there have been no changes. The upgrades were done OTA, restore from 5.1.1.
However both times I have not set the phone as new and have restored backups.
Is anybody facing a similar issue ?
Any suggestions ?

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Has any of this been tried?

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