^ Have you introduced any new sources of interference into your house? When my son was young, his video baby monitor destroyed my 2.4 Ghz wifi signal. Checking both 5 and 2.4 bands (if possible) might help rule out interference as the culprit. 5 is typically less prone to interference.
And your wired connection is still fast? If so, I would guess that the cable to your house is fine (although the outages are another issue all together), and there is a fault with the wifi portion of your modem/router. Or, as mentioned above, interference.
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