Stereo receiver or Turntable issue?

Hello all. I have Marantz 2245 paired with a Technics 1200 MK5. When I switch to the phono selector and running my turntable, the sound coming out sounds distant/ muted, almost like there’s dust on the needle. All the other selectors when I use my CD player or aux sound fine. I switched to a new Ortofon blue cartridge, because I thought it might be the needle, but no change. Any ideas what might be going on? Thank you.