Question about Wi-FI

I am a software engineer, not a hardware expert (and I count the wifi router as hardware), but...

I don't buy that explanation at all. Most routers should handle hundreds of connections. The symptom of having too many is simply very slow internet service, not dropped connections and the idea that all of the connections dropping at once because of low bandwidth sounds ridiculous. I think their explanation is nonsense.

It sounds to me like there is a problem with the router. The ISP should provide you with a new one (if it is there).

By the way, you can buy your own router. Many times this will even save you money over the long term.

What's the Wi-Fi like in your area? It may be a local problem and that can only be solved by having new cabling installed or moving.

Old WiFi routers have a limited number of connections and do not do a good job of clearing them out when they go inactive so they fill up and need to be rebooted periodically. Some even have a setting that will reboot them every day at a certain time. Newer routers are a lot better at this.

Internet disconnect happens to me during some days, so I am thinking it has to do with heavy internet traffic. At night there are no problems. My internet provider cannot check my connection or problems by phone line when this happens because I am not using the wifi modem (ADSL) they provided. I use a store bought wifi modem/router. Using the computers diagnostic helps in some cases, with the problem being solved by a reset of the adapter. I also have Netgear Genie which can help only so much when the internet keeps cutting out. It gets me back on only to have the connection cut out again.
Oh, and lately, when my internet connection cuts out, I noticed that somebody in the neighborhood has turned on their wifi printer, maybe it is interfering with my connection also. I do check to see the wifi activity in my neighborhood.