First things first, I'd make sure your battery is
PROPERLY charged
AND get your battery load tested. A poorly charged or just a tired battery could be the cause of the issues you are describing! :lecturef_smilie:
As for the ground on the frame, after jacking up the front of your Spyder, putting it on axle stands, and removing the front left wheel,; look forward into the middle of the Spyder from behind the front left brake disc. In the middle just behind the back wall of the frunk you should be able to see the back of the battery & the battery leads - follow the negative lead that comes across from the other side of the battery & snakes around the frame until you see where it's bolted securely onto the frame.... or where it
should be bolted securely onto the frame! That particular cable has a terminal in the middle of the cable there, so after checking that it's properly secured & tightened down on a clean bright spot of metal in that spot, you should probably follow the cable on as far as you can & check
every earth point to make sure they're all properly secured & tight

hyea:
Another thing to watch out for is that the bolts on your battery terminals themselves - they
MIGHT just be too long & so bottoming out in the battery post! Adding star washers between the terminal 'spade' & the bolt head can not only mean that your terminals never work loose again, but also that the bolt
actually tightens down onto the terminal, instead of just '
getting tight' as it bottoms out in its little hole! :banghead: It'd probably also pay to check that the terminal ends themselves are tight & soldered properly onto the cable, even if the bolts holding the terminals onto the frame are tight!! The metal terminal fittings have been known to be poorly fitted onto the cable! And if they are loose, it doesn't matter
HOW tight the bolts are!! :lecturef_smilie: Could also pay to check the bolts on the back of the starter etc, and probably even more importantly, the bolts on the DPS terminals! The DPS is a really power hungry unit!! :shocked:
I'm not necessarily saying
any of this will definitely solve your issues, but they're all things I've encountered in a variety of similar situations, so may possibly be at least contributing!
Good Luck! :cheers: