Cannot connect - wrong network error - Chrome

For 3 days my Metamask has been unable to connect to any websites. Uniswap is the most obvious one as I use it daily.
I just get the following errors.

"Wrong Network

##### Please connect to the appropriate Ethereum network."

I am using Chrome Version 91.0.4472.101 (Official Build) (64-bit)
Metamask extension 9.5.9
Windows 10 x64
I use Chrome only as it’s the only platform I am aware of that supports Ledger hardware devices. Firefox does not, I tried.

I’ve never changed networks. It’s always on the Main Ethereum network. I’ve tried changing network from this and back again, same issue.
It’s now becoming quite a problem as I am unable to move funds in and out of my Uniswap Liquidity Pools.
Kindly advise on how to rectify.