Inconsistent behavior in using Taxonomy API

Hi Paul this sounds like a SharePoint timer or indexing issue.  Some things to try out and test:

1. How many terms are you loading or creating? Try reducing the number as see if that resolves the issue.
2. How often are you running this solution? Try reducing the number of runs and see if that resolves the issue.

If either of the above resolves the issue there are 2 ways off the top of my head for handling this:

1. Easiest solution is to “throw more power at it”. Increase the RAM and / or processors and / or disk speeds and see if it can handle large loads.
2. Alternatively, evaluate the SharePoint timer and indexing jobs if you can. You may be able to increase the frequency.  Alternatively, this should give you clues on the delays you may need to add to your code to properly pause the record passing.  If you are bound to the speed of the SharePoint, then coding to pause to those speeds is the best you can do.

Hope these ideas help and there may be more.  If you need assistance, my company specializes in these things and may be able to help.  https://www.eswcompany.com/sharepoint-consulting-2/.