Guest user cart automatically empties itself after 1 hour

I am facing an issue where the products added in the cart automatically gets removed after 1 hour. I am facing this issue only for guest user.

I have checked the following values and found them to be OK,

I set [ Persistence Lifetime (seconds) ] : 31536000

I have checked the [ session.gc_maxlifetime ] : 1440

I set the [ Cookie Lifetime ] : 86400

Now I am not sure what I need to check further in order to fix this issue. Could someone plz suggest or guide me regarding this issue.