nikon 1 s1 overheating

[D3v1l]

hi

i bought one S1 for my girlfriend. she uses it mostly to film her youtube stuff, and she says that the camera heats a lot.
one time shutted down itself

the videos are 20min long maximum..

is it normal? i've read that some en-el15 batteries were recalled, but the s1 uses the en-el20

anyone with this camera got the same problem?

thank you