Hello Oscar56:
Smart Assist on my 2020 Explore E+4 went from smooth, flawless operation to being 'surgy' and having a terrible delay in activation of the assist. Sometimes goes for several seconds when on a near level stretch. Now usually at about 0.6 second delay. The original on-line literature cited about 0.2 second delay. Before website went dark(recent) the number had been changed to 0.6 seconds. My LBS is unable to restore to original settings. I have wondered if this was an intentional attempt to keep unwary riders from having their bike lurch forward at a red light or stop sign. I can't explain the long, long delays except that perhaps the sensors and software keep resetting the 'application' of the assist before the new 0.6 seconds has elapsed, hence the lag just gets incredibly long. Might even play into the 'surgy' behavior. Do you know of anyone that has found a solution to this? Please feel free to share my post.
Many thanks, Alvin1957