Wi-Fi problem with I Pad

I have 2 Wi-Fi’s given me, same except one is 5G. A few months ago 5G disappeared. It is on my network but does not connect and says I can’t join. Spectrum has no clue & wants to send a tech to my home. I used to interchange both and now both say “weak security”, but I cannot use 5G. I just found this community. Any help? My Modem & Router are 2 in 1 and Spectrum just had me reset the box by holding a paper clip inside the reset opening above the coaxial cable, but it only disconnected Spectrum on my phone, so I lost the dial tone & Spectrum repair.

(Beth)