Mailbox Sensor Falling Offline—How to get responses from support?

Long story short, I bought the mailbox sensor after it came out. I bought the bridge at the same time. It worked great until about March, when it suddenly started going off-line on a regular basis. After a ton of troubleshooting, I was sent a replacement sensor. However, the same issues are persisting. I’ve done all of the level one and two troubleshooting multiple times, and nothing solves the issue. It seems I either got two defective ones, or the bridge is a problem, or there’s a software issue. However, the other lights paired with the bridge have not had the same disconnection problems.I’ve called that number many times and spent hours on the phone. Can’t get through to anyone who will help. I’ve been told I need to talk to advanced tech support, but no one responds. I’ve been on hold with level 1 and 2 agents for close to an hour waiting for advanced support before we schedule a call back, but I get no call back. Does anyone know how to get a response or escalate this with someone in management to get it resolved? I don’t have time to keep calling and waiting on hold and rehashing the issue.