Default [Q] Dialing problem WIUI 2.4.20 Stable (GB)

Got a weird issue with calling.

After a couple of days (2-3) of use without rebooting dialer just says dialing but cant connect. Can receive calls normally though. After rebooting dialing starts working again.

Had this same issue with stock miuiandroid and stock with etana kernel as well.

Also noticed that after 2-3 days of use ram is running low on about 40. Could this dialing problem be low ram related? Any other ideas?