Solution:
1. The battery is too low;
2. The beard clogs the blade;
3. The blade net is damaged ;
4. When cleaning the blade head assembly, it is not installed incorrectly or the original blade or blade net is confused.
You can perform the troubleshooting as follows:
1. Recharging attempt;
2. Try after cleaning blade head and blade net;
3. Try to replace the blade head component.
Does it help?