Device slows down after a short time without any major configuration changes
I've been using an AX55 router for several months. After switching from an Archer C6U, I was delighted with the improvement. But for the past two weeks, the AX55 has been behaving similarly. WiFi speeds are much slower, and sometimes devices won't connect immediately, with occasional delays. One work laptop often won't connect to the network in the morning. I've been investigating this issue since yesterday. Today, I discovered that if I reset the router and just go through the initial setup, everything works as it did when I bought it. But after a few minutes without changing any configuration, the router slows down again. The only thing that happens is devices connect to the router. I have about 30 devices: TVs, laptops, smartphones, IOT devices, and so on. But I haven't added any devices in the last two weeks. Could it be that this router can't handle so many WiFi devices? If I disable some devices so there are fewer than 20 connected, the router is still slow.
