Hi Gaetan,
I recently have a customer had similar issue after they applied patches to the OS. Though they were running COM over linux.
Without more detail it is hard to determine the root causes, however, there are a several actions you may consider to take:
1. Check the licensing log - see whether this is license related
2. There was a patch for SSL Certification for COM 3.1.3, you want consider apply the path to ensure it is not the SSL Cert related
3. Run BackUpAll script to save all configuration. As the worst case scenario, you can re-deploy COM ova and restore all configuration.
I encourage you to open a case with GTAC. After the dusts settled, consider upgrade to XMC or COM Plus.
Thanks,
Gates