This is weird.
I had been using a D-Link DIR-655 in my home office, connected to a D-Link DIR-868L that was the main router for the house. Every few weeks, the wifi would drop out on the office router. A reboot would fix this. Since there is really only a printer on it wirelessly I would notice it only when I tried to print, which is a rare occurrence. Recently a Sonos speaker was added to the office, this also connects wirelessly.
At one point I replaced the DIR-655 with another DIR-655 that was a leftover device (I'm in the networking world so I have a lot of devices...) This one also suffered from the wireless failure but the wired never had a problem. I assumed it was a 655-specific issue.
When the wireless dropped out, the main router console would be inaccessible, despite the fact that the wired portions (which a desktop and NAS are connected to) still ran perfectly.
I purchased a new Synology main router and moved the DIR-868L into the office to solve this dropout problem once and for all. Then, this morning when I was accessing the Sonos from the family room I noticed the office speaker was offline. I pinged the NAS and desktop (both wired) and everything was running fine. I tried to access the router from the IP address. Nothing, it just hung and timed out. Rebooted it and everything is running again.
In the 2 years that the DIR-868L was running before it never lost wireless. Why now is this happening? Clearly it is location-related, not hardware-related. Outside of the office are 2 central air units.
Any thoughts?