ABS/Hill Assist/Vehicle Diagnostics lights up all at the same time. Now car has started to automatically drop speed , even on flat roads, from 75-80mph to 50mph in >5sec.

What is your question?

Lights started showing up about a week ago and this incident happened FOUR times today driving into work on the hwy where speeds can reach upwards of 80-85 mph. Car decelerates automatically!

What makes this problem better or worse?

not driving

How long has your 2014 Subaru Forester had this problem?

a week