Modem fast, router slow

Hey guise,

5 days ago, my modem stopped working for some reason. I called my ISP provider and a technician came and fixed the issue. But for some reason my router became really slow. My speed before my modem stopped working were around 5Mb/s through my router and modem. Now my router only gives me around .3 - .5 if I'm lucky, wired and wireless. My modem is still giving me full speed, 5 Mb/s. My question is, has this technician guy made something so that my router doesn't give me full speed? . Is there something I can do to fix it??
 
Had the same problem with slow router( although to be fair its always slow!) it was doing 0.08 Mbps download speed. It turned out to be a bad mircrofilter.
 
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