Question Pro-ject Debut Carbon skipping

[Rikcougar]

Good afternoon all
I have a Pro-ject Debut carbon which I run through my Sonos system
It seems to skip every 5 seconds or so
I have set the tracking force to the correct 1.8 g using a measure it and the bias is on the second slot
Turntable is not quite level but pretty close, catridger is original 2M red and turntable is around 10 years old
It has not has a lot of use in that time
Any thoughts on what will fix it greatfully received
I also have an AT LP120XBT-USB which has the same problem, I guess it must be a Sonos thing

 

[RoA]

Could be antiskate, bearings or tonearm internal cabling catching somewhere.

 

[Al ears]

Odd that it skips with such regularity, check weight with a proper set of scales, set anti skate to zero and check condition of the cartridge itself.
Is it the turntables issue or the fact Sonus cannot accept input. Don't know hor you connect a turntable to a Sonus output mind you.....
Doesn't it need a preamp?