Yes they do get louder but I can’t remember if sudden or not, best to have a rehoming plan for him asap...I was able to keep my rooster somewhat quiet by putting him in a box where he can’t stretch his head, in a shed, and letting him out around 10 each morning. I worked evenings so you might only be able to take him out earlier but at least it’s not 4am! Mine was a Silkie though and they usually have slightly quieter crows