Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the phone system. Additionally, who is your phone service provider please?
Appreciate the additionalinformation.
Are you using Mediacom's VoiceMail service or the Panasonic's built-in answering machine?
A likely possibility is that for some reason, the Mediacom's VoiceMail service has been inadvertently enabled and the "...beeps every 10 minutes..." is a reminder from them that there are messages in their server.
Have you tried calling/inquiring from mediacom?
If have not been tried, can we ensure that the VoiceMail detection of the Panasonic is turned off?
MENU # 3 3 2
use ▲/▼ keys to select Off
SAVE, then OFF
Yes please and would look forward to an update by then.
Sorry to hear of this.
is the beep heard from a handset only, from the base only, or from both?
Let's try other tests.
Interesting...and back to the basics; a review...have you set the Date and Time?
And the ALARM is set to Off?
Appreciate your patience.
Now we try simulating a soft reset of the phone syste
Since this is a "...new phone..." and we have performed all the readily doable in-house checks, the only test remaining would be to try the phone system to a friend's or neighbor's phone line.
Would you be comfortable giving this a try?
Yes; please do a Ctrl + D to bookmark this page
or click on the links in the emails sent by the site.
When conveniently able, post back with an update and I would be prompted to reply soon as able.
Which then would eliminate the new Panasonic KZ-TG3634 as a suspect
...and brings us back to the telephone wires / house wiring (least likely)
...or the phone service the wires carry; Mediacom (most likely).
Are there any other devices, fax machine, emergency calling devices, security system that makes use of the same telephone line?
By process of elimination, it would point to the Mediacom service.
We have checked/tested all the possible settings/suspects and even tried another telephone line with your friend.
The only factor left would be with the phone company.
That would be great.
Would look forward to an update when able.