I had a Caseta PD-6WCL switch wired in an attic space which I used for several years with a Pico remote to control a set of flood lights and an Arlo security camera in my back yard. It stopped working recently, so I replaced it with a Caseta PDW-6WCL switch (seems to be the same product). I can't get the switch to do anything. The green lights on the side of the switch flash sequentially from bottom to top (I tried to post a video of this - won't load the file to attach to this post) repeatedly but nothing else happens. It won't operate the lights or pair with the bridge. I have tried the following things: removed and reinstalled switch, moved bridge as close to switch as possible, factory reset, pulled out the gap switch, searched the web and this forum for answers without success. All my other Caseta switches are working properly. Any advice would be appreciated.