2016 2L automatic. Same problem, not driving enough now. Slightly different first occurrence. It started OK at home, but then failed to start to come back from the supermarket. I tried the key for only a couple of seconds each time. I cadged a jump-start, and perhaps held the key for longer, when it eventually started. I replaced the battery, the previous one did test to only 50% original capacity, so was about due anyway. Replacement is significantly beefier, 60Ah/620CCA. However, the failure to start on first key persists. Now I am holding the key longer, it waits many seconds, making some tentative noises, and eventually starts. I still have 6 months to run on the dealer's warranty, so have a little time to see whether this really needs attention before contacting the garage. I will try starting it up up more frequently (as suggested in this thread) to see whether that improves things. I have a digital scope, so I'll maybe attempt a start while monitoring battery voltage and current (voltage across the GND tail to the battery).
Is this a well-documented problem that will cure itself once we start driving daily again?
Is any damage being done and it has to be got to a garage ASAP?
What is the delay about? Is the EMU having to recalibrate sensors?
It it likely to start eventually each time, or will it refuse in some supermarket carpark and leave my food thawing while the roadside service arrives?