I have a lucky miner LV07, it is bound to my my local mining pool (Public Pool) installed on my Umbrel Full Node.
Does this local mining pool have open source code? If this came from another source, would you mind checking the backend to see if there's a log? We can maybe see some of the issue under those logs why your miner keeps reconnecting every 1 or 3 days.
Have you tried the miner to mine on another pool to monitor if it's running fine without the same issue? If it confirms it works just fine, then the issue is in your local pool; it might be an internet/router firewall. Much better if you could pull out the logs from your mining pool; it might give you some hints why it keeps reconnecting every 1/3 days.