Screw compressor: low gas production efficiency

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Dear forum members, I have a question I’d like to ask. I own a Bolton screw air compressor, the BLT-20A, which is used to supply air for automatic spinning machines in the textile industry. The system setup consists of the air compressor, air tank, filter, refrigerated dryer, additional filter, valves, and two spinning machines – with a minimum required air supply pressure of 0.65 bar. I already replaced the screw compressor’s rotor once, as the belt connecting the drive shafts was too tight, resulting in the breakage of the input shaft of the rotor. After it was working normally for some time, I noticed that recently it could no longer keep up with the air demand; it kept showing that it was still loading, without being able to release air at all. The required air pressure is between 0.6 and 0.8 bars, but currently it can only achieve a pressure of around 0.65–0.68 bars. I’m not sure what the reason for this is. If the winding machine is not supplied with air while it is idle, the value can be reduced to 0.78. Please ask an expert to help identify the reason