Same here numerous times today and in the past days. Most often it says:
No reason phrase, Error 529
Then you need to verify that you are not a robot by clicking numerous examples.... I can not even spend my E and nerve without at least doing it twice. This way torn is hardly playable for me and definately not enjoyable.
I tried another browser and cleared my cache, but no change. There would be nothing special on a screenshot as everything looks normal. On the upper left it says "Waiting for a race to start. More drivers are required for the race to start" when I pass the green race icon. On the race page I can see a normal race result but nor can I start a new race nor leave the present one.
I am hardly racing anymore as it is in some way boring. This would give me a little more motivation to race again. I would delete racing points and only use points again. Then you dont need a conversion, and after a race you directly earn your points. 3 points for a win seem realistic to me. So all upgrades would be done with normal points. If that was implemented I would regret to not race more. My racing skill is not very high.