Solved
For the record, this issue has been dealt with offline with a Technical Support case.
The root cause was a lack of memory assigned to the VM running ThingWorx Analytics Server.
More details can be found at https://www.ptc.com/en/support/article?n=CS286607
Could you pelase accept this response as corretc answer so that other will find it more easily
Thank you
Kind regards
Christophe
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