this is 8th generation proc, so i gues, you bought a year ago, or so.
the battery must full, of course, but it can be that it can’t produce the voltage the laptop needed, a sign that the battery isn’t that well… and when the voltage drops, you are not given any notice that the battery time is up, because that depends on another read-out. i am not an expert about mA, voltage, watt etc…
this kind of procs drain the battery fast, when used at high speed… but you say, after a minute the laptop stops, you loaded a project?
my laptop hasn’t that big of battery, didn’t test cubase on battery (because this kind of programs are not really suitable, in my opinion, to operate on battery), and a has i7-9750H, 16gb and a gtx 1050 4gb. it is a 15.6 laptop, so not a lot of room for a big battery. the room is taken by the cooling, the vents are big…
i am in my studio now, working with cubase, so my laptop has not the elicenser now.
how to solve it? test your battery. there are programs for it, and windows 10 home, there are options to control health (?).
does the problem only occur with cubase?