I have Hilti vacuum cleaner working fine for one and half year, but now it stops runing after 15 or 20 min. I can only hear inside relay clicking 3 times from time tot time, as usual its doing for cleaning filter. Not the strong sound, just relay click. If I switch it on after 10-15 min it will work again for maibe 5 min, then stops. Probably overheating problem. I open the lids and check the motor. Every thing is clean and lucks fine, brushes like new, no marks of overheating or burning on the coils.

Drills - Hilti - TE 7-C 120V Rotary Hammer Drill