Hi, I am Paolo from Italy.
I have the same problem (I have may AM5 mount since first days of October). T
My dovetail saddle clamps stick since last week after about 20 OTA-mount/dismount sessions.
My load is about 7.5 Kg (OTA is a SW Esprit 80ED with ASI 294MC Pro + miniscope with ASI 120Mini).
I will try to use a "silicone lubrificant" as indicated in ASIMount@ZWO answer to Ewolfe
...but, in my opinion, I found also that the springs in the dovetail saddle clamps are weak.
Stronger springs would help the clamps open better