Roxen restart or reload causes many modules to crash aleatory

Hi pike team.

I would need someone who is a roxen webserver guru to tell us how to 
diagnose a case that is causing us a lot of problems in the company.

We have been using roxen for many years, but lately the new versions 
present a problem that we do not know how to diagnose.

On a server where we have several websites, when restarting roxen, we 
notice that some modules randomly load with error.

The same module can load correctly on one site and incorrectly on 
another, all very randomly, and without no apparent reason.

For this reason we would be grateful if you could give us some 
guidelines to detect the cause of the problem or maybe there is someone 
pike user that knows the cause.

Kind Regards

David Estopà Mesa