Had the same error. Twice.
First one appeared about 6 weeks back. Was putting bike on side stand. Suddenly DSS error apppeared. Able to get round problem by starting bikewhen upright and sitting on it. All seemed ok otherwise. Dealer couldn't understand the problem, but changed the rear swingarm sensor and all seemed ok. That was 2 weeks ago.
Then the dreaded error came up again today. Just switched to Enduro mode over a bumpy carpark. Appeared out of the blue. Could still get rid of it by earlier trick. But the moment there was any fork dive, ie off loading of the swingarm, error will appear again.
Was looking on the net a bit more, and a French site posted a possible reason.
The wire connection to the sensor is loose. Not the exterior insulation, but the actual copper.
The reason is that the cable is tied too tightly on the swing arm and there is no slack to allow for large swingarm movments.
Which makes sense in my case as it happened when the swingarm was jacked high up in Enduro mode.
Will require a replacement. No good as I have a Tour in the Brecon Mountains (Wales) lined up this weekend. But if I could do some field repairs, might be able to salvage.