Thunderbolt display connection cutting in and out

I have a 2017 MacBook Pro connected to an external Thunderbolt display. The connection between the computer and the external monitor occasionally cuts out, leaving the display black. I also lose audio when this happens. This doesn't seem to be a software issue, the signal losss happens when I run Adobe apps or Microsoft apps or any other apps. This has been going on for about a year and is getting worse. MacBook is running Monterey 12.6. It is sometimes helpful if I restart the computer or switch port connections, then the display will work again. My magsafe cable and adapter old, but my local Mac repair people say they do not think it is the physical cable that is the issue.

Here are the specs on the Thunderbolt Display:

 Vendor Name: Apple Inc.

 Device Name: Thunderbolt Display

 Mode: Thunderbolt

 Device ID: 0x8002

 Vendor ID: 0x1

 Device Revision: 0x1

 UID: 0x000100010017E930

 Route String: 1

 Firmware Version: 26.2

 Port (Upstream):

 Status: Device connected

 Link Status: 0x2 / 0x1

 Speed: Up to 10 Gb/s x2

 Port Micro Firmware Version: 2.0.7

 Port:

 Status: No device connected

 Link Status: 0x7

 Speed: Up to 10 Gb/s x2

 Port Micro Firmware Version: 2.0.7