Am I the only one getting really frustrated with the CX "Manage Booking" functionality?

"Due to internal system error, you are unable to proceed further. Please close the current browser and try again. Should this problem persist, please contact our Online Services Support."

Not the first time and sent several requests to get it fixed (and don't get a reply). It's a hit and miss. For straightforward online bookings it does not seem to be no problem at all. It appears at least in my latest two cases that if a redemption award is tagged to it, then I have several issues like:

1.) Can't pay online (although button was available)
2.) Can't update passport details

Are there maybe others with similar experience, or is it really only me?

And yes, I have tried many things: two different computers, 4 different browser configurations, various permutations of closing, logging off and logging in again, etc. My incentive was great to try everything possible to not having to call the reservations hotline and wait for long time.

I fully understand that they can't get a much larger number of CSO's to answer calls. Their thinking is right to try pushing customers with simple requests towards the website and do as much as possible there. But then at least I expect it to work properly... I hope someone of CX is reading this Don't get me wrong: It's a great airline and I really enjoy the service, etc.