Me too.
Randomly the Wifi connection get's dropped (ever 1-2 days) and re-connecting is only possible after rebooting the Lumia 650. I tried with different Wifi networks at 2,4 Ghz.
When the Lumia 650 looses the connction to the Wifi it's trying to reconnect all the time and the battery is getting empty -> Reboot -> Wifi connects without problems.
Microsoft: Please fix this bug.
Me as well!!!
It looks as though I'm going to have to buy an android. Very disappointed with Microsoft on this issue. Promised so much, then leaves the game.