Web service keeps being unreachable on Free Tier

Hey there, it seems that i have an issue with my deployment. My staging web service is on the free tier. However, it keeps being unreachable if i send a request. I understand that the web service will go to sleep if there is no request and it will wake up when there is a request. However, it seems it does not wake up when i try to reach it after the first request and keeps sleeping before 60 minutes of inactivity. Seeing my metrics, the web service has not even reach its memory and cpu usage limit. Anyway you can help me with this?

Regards,
Gamma