Older Ooma not ringing on my end

I have a older Ooma, ( 5 years or older). Lately, calls to my house have been answered in 2 or 3 rings. My friends say the phone rings 10 to 15 times on their end. (most people hang up thinking I am not at home) Is this a signal that my Ooma is wearing out? It has worked flawlessly all these years. How will I know when to replace Ooma,other than when it fails completely?
PS, doesn’t happen on every call.

Try connecting only one phone to the Ooma Telo phone port and then have someone call you.

See if things change or are the same.