I have two Wemo bulbs that I’ve been using in my living room for the past 8 months. My smartthings hub is in the adjacent room/office. After the latest update, the bulbs were uncontrollable with Amazon Echo or the smartthings app (iPad and Samsung phone).
I removed and reset the bulbs then re-added them. When I did this, I took a long Ethernet cable and brought the smartthings hub into the living room to pair them. The bulbs again worked as advertised.
So, I brought the hub back into the office and I’m back to not being able to control the bulbs. It seems like if the hub is in the same room, they work. It hasn’t been like this the last 8 months and I have no idea why it just started. The distance from the hub while in the office to the closest lamp is 8-10 feet through one interior wall. The other one is about 20-25 feet.