Door sensor went offline right after I went out of town

I set up my system about a week ago, and everything was fine... until I left town! Then, a day into my trip, I got notified that the front door sensor went offline. I checked the logs and this is the first time it did this. And unfortunately its still offline a day later. Is there anything I can do remotely? I thought about removing and re-adding the device but I don't know if I can do that remotely...thx, Steve