A few likely culprits:

• Router placement and interference (microwaves, fish tanks, brick walls).
• Overcrowded 2.4 GHz channel; a quick channel scan can help.
• ISP modem signal issues or aging coax/connectors.
• Firmware bugs on the router; reboot helps, firmware update helps more.
• Device power saving turning off Wi-Fi adapters intermittently.

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What it might be (likely causes)

• Placement & obstacles
  Wi-Fi hates water and masonry. Aquariums, brick fireplaces, and metal racks can scatter or absorb signal. See practical placement notes and real-world examples here: /posts/kirksville-wifi-dead-zones/