Why is wifi not appearing on laptop and always disconnects??

It's likely a problem with the modem.
Reach out to Fizz for help.

Been happening to me too a few times lately. Unplugging and plugging the modem back in seems to fix it. Strangely, the phone seems to never lose wifi connection, maybe our laptop technology is just older and weaker than our phones.

Call Fizz directly....

Reset your modem, if it doesn’t work communicate with Fizz by messenger.They are usually fast to fix a problem....in my case anyway.

You need to try all those solution in this link before reaching the support. That's what they will say you to do.
https://fizz.ca/en/faq/my-modem-connected-cable-my-connec...

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