Problems including GE on/off toggle switches

Just switched from Vera Edge to Smartthings about a week ago. I have about 50 devices, Hue bulbs and Amazon Echo. I got everything installed on Smartthings, but everyday for the last 3 days, at least one light switch is not found anymore. I can exclude the switch, but I can’t include it again. I also have a 5 random zwave things that don’t control anything and they are not configured. I like Smartthings, but never experienced this with Vera. Would really appreciate any help. Thanks