I am running Thunderbird 38.5.1 on Ubuntu 15.10. Thunderbird does not download mail after a wake from suspend. Manually clicking mail folders trigger mail receipt but they never download automatically per my configuration set to check every 10 minutes. I am forced to exit and restart Thunderbird after every computer wake to get Thunderbird to download my mail. This started happening within the last 30 days or so. Past cases show this was resolved for an earlier version but I think this must be a new problem.