First i would like, please make sure that your P2P is following the best practice which can avoid usual outdoor deployment pitfalls.
I vaguely remember that our regional SE informed us about this an year ago that there are some CLI commands which once applied can give you relief to the issue you mentioned above. Here is how this works - commands once applied and if there is no Wireless link or connection between Root and non-root bridge then after certain period (user configurable) device will reboot on its own and will try re-estabilish the link. No more manual reboots and site visits etc.
I don't remember the commands, please check for those with support team and ensure that you are running latest on bridge.
Hope this helps.