Hello, I have a strange problem with my TP-Link Archer Adapter (I don't have the exact name and version on hand, I need to find back the box, but the width band seems to be 5GHz) on my PC.

Late in the evening (22h00-23h00), I lose my connection. However, I don't have this problem with my second PC (this one is portable), and I can connect to internet without any problem.

The next day, I still can't connect to internet but if I bring my computer closer to the modem, I get internet. From this point, I can bring back my computer to its original spot and still keep the connection (even though I shut down the computer to move it).

Other infos that could be useful: I am in Belgium and use the operator VOO (that use coaxial cable). Until recently, we used a different operator (Proximus), and I didn't have the problem (though the connection was of bad quality because they didn't put modern cables in the region. This was the reason we changed of operator)
I live in an old farm but I am not far from the modem (I am next to the room above the modem).

There is an high voltage pylon not far from our farm.