Router dying diagnostics please?

[HighDarkTemplar]

Hi again people!

I've got this router problem yesterday, it just stops all browser traffic without notice or reason. I have not done any configuration, on computers or the router itself for months. Rebooting the router helped for about 15 minutes or so. After rebooting a few times, I called my ISP and asked if they had done anything weird lately, and they hadn't and they also said that my router show up on their network and should work as intended. Afterwards, I tried to reset my router and set it up again from scratch and the same thing happens, only now it took approximately half an hour. I'm wondering if my router is dying (hardware), but how do I actually test my Linksys WRVS4400n?

Thanks alot!