Working calculated column breaks sometimes when saving, and sometimes not (70/30%)

[Susanne]

I made a calculated column which is the base of my report. It worked till last week. Last week it started to break. 

Breaking means that the calculated column works, till i press 'save'. Than it gives a **bleep**ue error that my syntax is incorrect. If I try it a few times it eventually starts working again. 

Now I got to the point I am afraid to make any changes, because I am afraid the column will break when saving. In my desktop and Service (development) it works at the moment, but in the TEST surrounding it broke and I am unable to get it back to work. 

I use the September version. 

[v-xiaoyan-msft]

Hi @Susanne ,

I tried to reproduce your problem but unfortunately without success.
Do you still have similar problems if you operate with a copy of this pbix?
Are you sure there are no other recent changes to this file?

Best Regards,
Community Support Team _ Caitlyn