We've had our 2 female GPs for a year now, and they've always been chatty little things, shouting at us every time we walked past for food etc.
We went on holiday last week and they stayed with PIL. Since they've been home they've stopped squeaking. We still here them occasionally but there's no mad excitement when we top up hay/throw in veg etc. They seem happy and normal, just not making noise.
This is very unlike them, should I be worried? PIL haven't had guineas before but did have rabbits so I know they'll have treated them properly. It's just so odd.