The reply cannot be helpful if any explanation is offered without knowing the category, make and model of the coffee maker.
Basically the water flow in the system is slowed. The machine may need descaling.
If the pump is louder than normal, it is air locked and will need manual priming to let it pump normal.
The manual priming is to inject a few drop of water into the pump (just like a speaker needs a sip of water to continue his speech).
To manually prime the pump you can use a syringe, a Turkey bastor (if you are in USA) or use a hand pump made available with some makes (included as accessory with Saeco, Gaggia espresso machines).
For descaling you may use the link to order a reliable descaler:
http://www.shop.partsguru.com/DSC-6x2-Gurus-Choice-Best-Descaler-Economy-pack-DSC-6x2.htm
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edward_bbd2c7ff4ee1828a
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