Hi @ThibautV,
Nothing is going on wrong. Those warnings are generated automatically by ThingWorx as a way to allow easier troubleshooting of issues if they'll appear in the future. They "record" the state of the system at that point in time and write it back to disk so that it can be consulted afterwards.
You can consider this a very lightweight way of "self-monitoring" that ThingWorx performs OOTB.