Network problem with personal bookings

Since a few weeks Microsoft Bookings very often shows me a specific notfication:

"Temporary problem in personal bookings - Unfortunately, there seems to be a temporary network problem with personal bookings. Please refresh or try again later."

My personal booking page then disappears (although I don't even use it, there is nothing set up in there) and I only see the shared bookings pages, which are relevant to me. However, if I want to access them, nothing really works: I can't make any changes, I can't set up a new service, I don't see the employees I added etc. The only thing that works is the booking page itself, so people can make bookings. Only the administration part doesn't function. This happens very often, in the App as well as in the Browser. Even for other colleagues of mine, this happens. I have found out though, that usually it works before 9 am and after 5pm (which are our companys office hours). And it occured as soon as more and more services were added to the page ( I am only talking about 10 services or so, and two shared booking pages.) Our internal tech service couldn't find a problem with my computer or so. Does anyone know, what might be the reason for this? Is there some setting maybe in bookings, that I need to change?

I would be very greatful for some tips!