Dear Customer,
Sorry to hear that.
Could you please send us the photos or video to show the problem?
Which coolant did you use?
Could you please try to disassemble the pump and clean the rotor?
Yes, you can replace the pump or upgrade to a stronger one.
BPTA-K1M (the original pump)
https://shop.bitspower.com/index.php?route=product/product&product_id=8052&search=K1M
BPTA-PHCL (the stronger pump)
https://shop.bitspower.com/index.php?route=product/product&product_id=8190&search=phcl