We're in the process of deploying collector into an area with synchronization must be done on a daily basis and the only access to internet is a fairly weak network.
Upon testing, Collector frequently crashes during attempting to sync.
From what I've seen the most frequent solution is to keep retrying until it works.
Since I'm sure many users also struggle with sync issues, I'm hoping some of you came up with usable work-arounds.
Despite overwhelming support for turning the sync-via-usb capability back on (as it existed in Arc Pad), this idea has not made it into "In Product Plan" territory, which is very disappointing. Perhaps your vote is the one needed to tip it over, as lousy (or security-blocked) WiFi is pretty common issue with Collector users.