It could.
A single cracked core or poor termination on one pair can drop the connection to 10/half....which is a nightmare if the client is running at 10/half already.

(The switch tries to compensate for the bad link, but the client can't.)
Run into this umpteen times, with the result that we usually crop the cable back and re-terminate it anyway...and since the modules are cheap, bin the old one as well.