iPhone iCloud calendar sync broken

[ComSubVie]

Since a few weeks I only see one iCloud calendar on my iPhone.

I checked: all my devices use the same ...@mac.com address, and in iCloud.com I can see all (8) my calendars.

However on my iPhone 4 running iOS 7.1.1 (at least since 7.1) I only see one calendar from iCloud. I tried a few things without success (each time I got a different calendar on my iPhone, but always only one):

• disabling iCloud calendar, reboot, enabling iCloud calendar, reboot
• removing iCloud account, reboot, adding iCloud account, reboot
• factory-resetting iPhone and restoring from iCloud
• updating to iOS 7.1.1

I also noticed that when I few my calendars on iOS (where I only see on), when touching the "i" Button the Calendar App crashes.

Any tips what I can do to get all my calendars on my iPhone?

 

[jr866gooner]

I find that when I switch off all calendars in the corresponding mail accounts and switch on again and all corrects itself.

 

[ComSubVie]

I tried this a few times, but unfortunately it never worked (see first bullet point)