NAT type ps3

recently ive been getting lots of summoning failed, specially with my friend
ports are already forwarded but my NAT type is strict again.
does any one know what i should do?

Normally reseting your router should do the trick (if it isn't strict most of the time). Sometimes you just have to wait it out for a couple of days and if that doesn't work, contact your service provider. I contacted mine once and after an hour wait or so they changed it back to open.

its been like a month and its strict, ive already reseted it
about the provider i dont know, cause we used some tricks here...