My ac1200 6120 won’t even even connect to my wifi router anymore

I doubt if anyone can help on the basis of that information.

 

Don't cram everything into the subject. Write something that explains what equipment you are using – what is this ac1200? – and what happens.

 

You can help people to help you by providing the information suggested in this forum's header:

 

Subject (Include model number and brief summary)
Model (Recommended - Helps the community give the best answers)
Body (Include additional detail including model version, firmware, OS and environment where relevant.)

They are there for a good reason.

 

 

 

R6120? EX6120

Firmware on it? 

Modem/gateway its connecting to? 

The R6120 doesn't connect to your wifi. It broadcasts the wifi and devices connect to it. 

but if its a the EX6120 its an extender and does connect to wifi and rebroadcast it. 

See how details are key to helping? 

So go over what you have in detail, what its connecting to, whats actually happening, even the led's on it can help. 

the more you tell us, the better we can help.