3Gs on ios 5.0.1 battery life way down, really tried everything

My trusted 3GS is very ill...
Symptoms: High temperature and very short batter life.
When: since 2 weeks.  For the best I can say, it was triggered when I spent 2 days at a rural area with poor coverage and in the border between Belgium (home network: "BASE") and France (the phone was jumping between home and roaming every hour)
Installed both 5.0 and 5.0.1 and they release dates, so it is not directly triggered by the update, although it can be related.
Treatment so far:
Soft reset, Hard-reset
Complete removal of a new Exchange account, which is not yet re-introduced. All other exchange/email accounts have been working perfectly for over 2 years.
Full Restore!!
Best hint at problem so far:
Logs say  Every 3 seconds:  - CommCenter [16] (Notice): Client[com.apple.persistentconnection[dataaccessd,54]] is telling PDP context 0 to goactive.
Could not find anything relevant (that is, recent) about this problem on the net.
Others: This happens even when connected to WifI, my provider supports 3G perfectly on my area.

An update on this.
I traced the battery issue on having PUSH enabled for my old Exchange account.
Note I still have another exchange account + yahoo + icloud  + gmail all with Push enabled, and the battery is perfectly fine now.
So the whole issue seems related to a recurrent synchronization problem. However it is hard to diagnosis this when the only entry on the log remains the 2s recurrent phone-global message:
Client[com.apple.persistentconnection[dataaccessd,54]] is telling PDP context 0 to goactive.
I agree one must hide technical complexities in the name of user friendliness, but adequate (deep) error reporting remains important ... at least for those users that the technical know how and will to dig deeper.

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