I have 2 88LM's and my primary one has been flaky for the last year with using the phone app to control the door. Typically would run into not responding and would have to wait for it to time out to retry. Today, per notifications the garage door stopped, closed, then stopped. i arrived home after work to find the door open. The wall control panel was not working as it did not have any power so after troubleshooting and a phone call, i placed an order for a replacement. With the 88LM still connected, my garage door opened overnight and was opened until i was ready to leave for work. A bit concerning that these things would fail and cause issues like this. it would suck to be away on vacation with no way to close the garage door. So dependent on this tech but when it fails you, its definitely an eye opener.