I've got a blank page problem

Hi,

I have BW running a daily backup of my database and a monthly backup of my site’s database and files. Now I want to switch to weekly backup to backup database+files.

It was possible to schedule a new Complete weekly job to backup database+files.

The problem:
If I press on Complete weekly to turn off the monthly schedule, the loaded page is blank and stays, even if I press reload in current Chrome and current Firefox.
When I hit reload a few minutes apart, it was loading Complete monthly and when trying to delete the plan, same thing happened. Page went blank. Everytime I press on the plans the page goes blank and it takes minutes that it shows the backups and hitting reload often.

Do you know of this behavior already and it is a BWP-thing and working on it or has this something to do with my shared hosting space and the memory or speed is just too low?

https://ww.wp.xz.cn/plugins/backupwordpress/