Its just the way the poorly designed Polaris engine operates.
Must go aftermarket to resolve this issue, Polaris seems to care naught about it.
RKT, PAR, IndyDan, MtnTek(?), and there are other options as well with varying degrees of cost/performance.
They will void warranty, but on the up side, you should have a much lesser chance of needing the warranty in the first place if you go aftermarket to start with.
It should just be known that from day 1, install some engine fix on the Pol 800s..
Otherwise your just rolling the dice until the inevitable day comes that you need a tow out and need to replace case, cylinders, crank, pistons, etc etc.
Yep, just here propagating paranoia and hysteria, some may say..but I refuse to put any faith/trust in these stock engines when it comes to longevity.