Random internet disconnects on wifi and ethernet

Hi,

My internet has been disconnecting randomly for over a month on multiple devices (computers, ipad, phone) on both wifi and ethernet. A tech came out and installed a new cable outside to my house and a new modem but it didn't fix the disconnects. The modem has a direct coax connection to the outside coax cable. I've reset the modem and gone so far as to reinstall Windows on one of my devices to troubleshoot any network adapter issues. I didn't have any problems for years until a little over a month ago and nothing has changed in my house. I'm even having trouble submitting this question because the internet keeps cutting out.

Any help would be appreciated.

Thanks