Galaxy S2 constant errors?

Hi lads..
Im proud owner of Galaxy S 2 for 8month or so. Started to facing some weird problems couple days ago. First was - no WiFi connecting (No MAC Address and cant turn it off). Now Process system is not responding errors with 2 options Force close and Wait. No matter which i choose, phone does quick reboot, like when windows explorer hangs and recovers. Can it be damaged nand storage? Phone where used a lot for data storage (Around 2GB per day where written on device and erased). Still should have warranty, but its tricky, coz have no time to wait 2-4weeks. Phone never been rooted. Any tools to check internal memory health?

Thanks a lot.

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