Remote access bumped offline daily

Server Version#: 1.15.3.876
Player Version#: remote access
I’m running on a QNAP 251B
I have my router port 32400 opened, and I am able to see my server remotely via my phone or another remote PC when I enable remote access. But it doesn’t stay on constantly. Every day or two I have to do back in and re-enable remote access. After I retry the manual port, it kicks out remote access altogether. I re-enable remote access, apply the manual port, and remote access is back up.
What could be causing this issue with kicking the remote access offline daily?
The QNAP is on 24/7, with a UPS.
I would assume if you get remote access running the first time then all is well…

Solved, not sure how but issue went away

Could it be a software background problem?