Normally customers needn’t to take off the inlet hose from faucet during installation. You may need to check why customers have to take off the inlet hose and re-assmelby it.
Crack or thread damaged may occur when the inlet hose is taken off before installation, then re-assemble the inlet hose to the faucet under deck during installation. This is because the hose may not be put into the thread hole the first time. It is unseen, all by feeling.
Another important thing is NO HARD TURNING is needed when install inlet hose to the faucet, just HAND TIGHTING TILL STOP is enough