After my 3rd Nikon full frame DSLR failed on me at weddings, I ditched all of that product line and went to Fuji. Not because I was naive and thought Fuji would be problem free, just frustrated and time for a change.
My D3s (their flag ship for a short while) had 2 repairs at Nikon for a random locking up with ERR code on the top LCD. After 2 repairs and almost $900 (Canadian) it still wasn't fixed and Nikon didn't know what the problem was. The other 2 failed bodies (D700 and D610) both had different mechanical failures that each required approx $400 repair bills.
The grass isn't always greener on the other side.
Oh ... and a side note. When I got the D610 I had an incident where video I recorded did not get written to the memory card. I followed up with Nikon and they didn't know why that would happen. I later discovered that if the batter got low, there was a chance video would look like it was recording to the memory card but it wasn't! wtf From that point on I always made sure when shooting video for wedding clients that the D610 had a battery with more than 50% power. I was always worried that my video recording was in fact not recording after that. But I never had that video issue again.
So I have 2 new X-T2's that I use almost exclusively for 4K video. The 1st camera I've been using has stopped recording after a few minutes of recording. ( this has happened 3 times on 3 different cards)
It also only seems to happen once on a card.
Yes, I'm using the grip. Also I have tested several cards and I'm using the fastest card , SanDisk Extreme Pro 300. At first I thought maybe it was the card so I went to the fastest card.
But that doesn't seem to make a difference.
Any one else have this problem? I'm thinking it's a software bug at this point. Any word from Fuji on this?
Sorry if this topic has been covered before. I did do a search but nothing popped up.