I too have the exact same problem that you’ve mentioned about the pickup of the vehicle and moving past 75 with increased fan noise and difficulty in reaching speeds higher than 85.
All this I’ve seen happen even before the software update ever since the service team picked up my vehicle for a small correction with the brake tube in the front.
I’ve tracked this with my efficiency as well and have seen a big difference, where i used to be able to maintain an average of 36 to 37 wh/km with a combination of ride mode and sports mode but now with the same riding conditions i can never get anything better than 42.
The max number of kms i can get out is 55 with this combination.
Pickup too in the sports mode may have been effected slightly.
Repeated discussions with the customer care haven’t been very fruitful.
As for the software issue i too experienced the same shut down and had to wait a day for the technician to visit and revert to the earlier version. I was left stranded for those 2 days without a vehicle and it wasn’t good.