Operation in ambient air with a high dust content leads to premature clogging of the filter mats. As a result, the electronics of the MobilHybrid can heat up so much that the MobilHybrid reduces the output power until it switches off.
Please check the air filters. In particularly dusty environments, check the air filter more often, or weekly if necessary. Check air filters at all housing openings according to instructions and clean filters if necessary. Heavily soiled or damaged filter inserts must be replaced.