Nokia 6060 drops connection after short inactivity

[j]

I'm trying to get the opensync-gnokii plugin to work with a Nokia 6060.

Everything works fine, unless I'm trying to sync more than a few entries. 

* Opensync first collects all entries from both sources (which works fine), 
* than figures out which entries should be synchronized (which seems to take 
too lang for my phone, so it drops the connection), 
* and than tries to write entries to the phone (which fails with timeouts, 
since the phone has dropped the connection in the meantime).

The same can be reproduced with "gnokii --monitor". If I interrupt this for a 
few seconds (e.g. with CTRL-Z) it resumes working. After an interruption of 
maybe 30 seconds it failes to resume. 
Similarly xgnokii doesn't work, as it takes too long to open the menu. 

Is there a simple way to fix this? 
Would it be reasonable to modify the retry loop, so it resets the connection 
upon timeout? 

(I'm using the 6510 driver with mode dku5 and a cloned cable with ark3116 chip 
supported by the kernel)