I would ask the following:
Where are you getting your Pluto TV channel list?
If you say Kodi Addon, which one as I am aware of two and possibly three.
One observation about Pluto TV addons is that some show commercials where others show a Pluto TV logo in place of commercials.
Some of the problems I have seen with Pluto TV are:
About 7 seconds before a commercial there is a frame of black. This also seems to trigger some systems to begin to stutter.
Commercials in general are unreliable but getting better in that regard.
even on Xfinity streaming (completely different commercials) from Comcast, on the Xfinity Cable box, Pluto TV often hangs changing between commercials and programs.
I wish I could find a completely reliable Pluto TV source but they all seem to have issues.