As your MobiControl server has recently been upgraded, more than one factors may have been changed that causes your current problem.  You thus have to rule the factor out one after the other.

What was the version and build number of your MobiControl server before the upgrade?

How many different device models are currrently managed by your server instance?  Do all the different device models experience the same missing location data problem?

Are devices of the same model and agent version/build numbers  consistently having the same problem? Or does the occurence pattern looks random?

Have your tried collecting battery level with the SAME data-collection rule for collecting location data?  If so, are both location and battery level data missing when you check in your web-console?

This issue was affecting all of our devices which are the same make/model, software, etc.  They were all staged at the same time.  I was just reading through the latest agent release notes and noticed the fix below.  I am updating our agents to see if this corrects the issue.

Hello Jesse,

Thank you for posting on Soti Central!!

As you have quoted, the new Mobicontrol agent has the fix to the Device location issue (MCMR- 26091).