ring doorbell not working and only works if right beside router

I have a ring door bell bought 2 to 3 years ago. Worked fine for most parts now I lost connection to the ring doorbell so I took it out to diagnose the problem. I think something is wrong with it now since the only time I see the doorbell is if it is right beside the router. Moving it a bit further than 5 feet will not allow us to get a stable connection