Alarm clock app stops working?

Recently I have a problem with the "Alarm Clock App" which is installed by default in my Huawei 10mate. As soon as I try to activate the alarm clock, a white screen flashes very briefly and that's it!

Have already booted several times unsuccessful. Cache was deleted. Can someone help me here maybe? Another alarm clock from the Google Playstore has already been installed and works, but I would like to keep the standard alarm clock running!

HUAWEI Mate 10 lite - Android 8.0.0

First of all the whole problem has, as some may think, nothing to do with the current political stories with "Trump USA Google / China Huawei"!

Then download an alarm clock app from the store down and do not fret about it.

At the simplest solutions think the least…

Reading helps!

Can be nice but also. You want help.

Try restarting your phone

People please read my post.
"Have already booted several times unsuccessful."

Not everyone knows what is called booted. Your alarm clock is probably broken, you have no other option than to use an app.

Sorry did not know what "booted" mean you can also write normal and a simple yes would have been enough.

Sry, if I struck too hard ;-)
but with "the simplest solutions think the least…" I felt a bit affronted, since I had already before my post on "good question", I had extensively informed myself with the problem in other ways. - So, all in OK.

PS.: Another app from the APP store, I tried and works well, but I like to work with the included on-board means a smartphone from "home" brings.

At the simplest solutions think the least…

That was my comment. I had just skimmed the text. Sorry, please. Once again confirmed - I should read texts word for word.

Update: The error is found.

where the three points are, was in the submenu something with "… Update reset."

Said and done - works again.

The submenu (3 points) is no longer visible. Was apparently a broken update or broken record. K.A!
Anyway, thanks to everyone for your help!