Welcome to the Community!
We're not reporting any issues with cPanel login that would remain for an entire month. This would appear to be a local issue for you. We suggest you try the following to access your admin screen.
> Try your access to the account from a private/incognito browsing window
> Clear the cache and cookies of the browser in use
> Make sure pop-ups and scripts are enabled in your browser
If you're having problems with account access at the same time, please try another network or contact your ISP.