You should be able to check your usage dashboard to see if you have hit any limits.
Settings->Data->Data Sources->Replace
You can replace the Google Sheet with itself.
RANDBETWEEN() is a volatile function and is best avoided as it can slow your spreadsheet down.
A much better option in this case is to use the Roll Dice plugin column.
If you use that, then you get instant results in the App and you eliminate any data sync concerns.
The Updates section at the top, thats where syncs are counted. But that’s clearly not a problem.
What you are referring to there is Extra Data Sync mode, which should be available with any paid plan. When it’s enabled, Glide will sync with your spreadsheet every few minutes while users are active on your App. Which may or may not help.
Regardless, as I already mentioned - if you need to generate random numbers in Glide, then the best way to do it is with the plugin column that I linked to earlier.
That post is two years old. A lot has changed since then. I’m pretty sure that @Robert_Petitto would agree with me when I say that using randbetween() in a GoogleSheet to generate random numbers is not a good idea.