KSC Makarov PM GBB Pistol (System 7) problems

[Armata]

Bought this modelas new from one of the dealers. Unfortunately as much as I loved look and feel of the gun, I was forced to return the pistol back as it has developed a technical problem and stopped firing completely. Now looking through various dealerships noted that this model was discontinued. Is anyone had the same problems?
In my view it is the best copy of Makarov pistol on the market but problem with trigger and valve knocker operation let it down. Not sure if it will be replaced and KSC plan to introduce new model in the future?