Here are some of the possibilities:
Check your tank pressure. Please follow the instructions below. When water stops running out from the faucet; check the tank weight, if it's more than 10 Lbs, that means that the tank air pressure is down. Use a bicycle manual pump and start adding air, and the entire process takes about 10 to 15 minutes to fill the tank at its optimal PSI (6 - 7 PSI ) while the tank water bladder is completely empty. Make sure to not add air ( in all tanks at once) because that will damage the air bladder. When pumping air to the tank, only make 2 pumps at a time and wait until the tank releases water out from the topwater threaded valve, once the water stops make proceed to make another 2 pumps and repeat the cycle until all the water comes out of the tank and then check what's the air pressure, it has to be between 6 to 7 PSI max with no more water coming out.
The last time your membrane was installed/replaced: If your membrane is older than 2 years or if your incoming water PPM is higher than 400 PPM, there is a high possibility that your membrane is clogged. In such a case, you can try flushing it or consider changing it. To flush the membrane, bypass the flow restrictor and allow the water to flow freely for 5 to 10 minutes. If your membrane is older than 2 years, please replace it.
Check your system's flow restrictor and the Auto shut-off valve (ASV). Usually, these two valves are good for 3 to 7 years, but sometimes the ASV becomes faulty if your incoming water pressure is higher than 80 PSI or lower than 50 PSI. The system cannot produce water if the pressure drops below 45 PSI (this issue often arises shortly after buying the system; it works fine for 2 months, and then the problem starts). Once the sediment filter starts clogging with dirt and the pressure drops to 45 PSI, the system will not produce water, and the production will direct to waste.