Randomly lose access to devices on local network through hostname

[totopesce]

Ive been having this problem for a while now and havent been able to find a solution. I have some devices that I access on my local network, nas, 3d printer, other pcs, home assistant, normally I access everything by its hostname as its easier to remember the ips of every device, most devices have static ip, the thing is sometimes it will just stop working and I have to either reboot the router or wait several hours for it to start working again.

For dns on the router theres only 1.1.1.1 and 8.8.8.8, and I havent configured dns on any other device.

Im on an ac86u with firmware 3.0.0.4.386_48260, Ive updated it a couple times, but it hasnt fixed it.

Thanks