VPLS tunnel failing until wireless link restarted

Hi, I run VPLS tunnels using MPLS on wireless links so as not to use WDS I have been having the problem where very occasionally the tunnels will randomly stop connecting. The way to solve it is simply to disconnect and reconnect the wireless link and tunnel comes back up???

I have not tried any newer software package than 6.2 as there is lots of reports of boards failing on updates etc so I am scared to upgrade newer at the momentas they are remote sites and in production.

Does anybody know if newer software will solve this or if any settings can help?