Sorry that happened to you. I have not shot with the GH5, but consistently had the same problem with the Panasonic G7 and that same Lexar card (mine was 1000x). As soon as I switched cards-- over a year ago-- I have not had the problem. There were other G7 users who had the same problem with that Lexar card and they have reported that the problem was resolved when they switched cards. I did not try to retrieve the info on the card as it was not critical, so I can't help you with that one. Hope this helps and sorry again for your problem.

There seems to be some mdt recovering programs when googling "recover .mdt". There is always a risk of virus with these little programs.

Yep I am using lexar cards (the same model as you) and they do not play nice with gh5. Very laggy. I ordered some Sandisks last week but haven't received them yet. Good luck with the recovery.

Switch cards ASAP is the only thing you can do unless Panasonic decides to make their cameras play nice with Lexar.

What a horror story :(

I picked up a couple of the Lexar 2000x cards - no problems thus far.

@Frost: OEM battery. I have a number of these that I've picked up since the GH3.

FWIW - I have found that the GH5 does use batteries much faster than the GH4. Not unexpected given some of the GH5 features. And to be fair, the GH4 has excellent battery life compared to any of my other cameras.

I had the same thing happen to me, but my files did not get corupted. There seems to be a problem with the Lexar cards... Also there are a few more people on Facebook that have the same problem with the Lexar cards. Someone suggested to format the card in windows and not in the camera, that did the trick for me so far. But still it sucks that i didnt know this before i spend so much money on the card...

I had the same problem with the Lexar 1000x 128 card (I only bought 1) in both my G7 and G85. Searching on-line showed others were having issues with this same card. It's relegated to photos only for now. I bought some Transcend 64 GB U3 cards and Sandisk Extreme 90 MB/sec U3. No problems in either camera with these cards.

SuperTinyMagnet. It's my fourth time freezing on me, wedding ceremony (f&$#) - dance performance - commercial set. If anyone has any information I'd really appreciate it. I don't trust this machine, I can't. Thanks guys.

GH5 is more clever with "too slow card error" than GH4. GH5 almost always saves the file when it stops and says "too slow card". GH4 makes always unreadable .mdt file.

I've also used aeroquartet (also known as treasured), cost me $100+ but they successfully got my video back, albeit at a different framerate for some reason, but I just used interpret footage in Premiere Pro.
I don't trust anything but Sandisk Extreme Pro cards now. Was using Transcend.

Hi guys. I was on a paid shoot today and experienced the freeze on recording. I pressed record to stop after a 23 minute take and it was simply stuck on record. Well, it wasn't still recording actually as the red record symbol wasn't flashing like usual, it was on constantly and the seconds weren't ticking away. I left it 5 minutes and still no change. I turned the camera off and it stayed on. In the end I took out the battery. When I turned the gh5 back on I had lost that take!! I was recording in PAL, 25 fps, 4k 10bit. What I'm most concerned about is that from the above posts, it looked like the memory cards were to blame, but I was using a 64gb Sandisk Extreme Pro. I'm also a wedding videographer so the thought of this happening on a ceremony or speeches has absolutely knocked my confidence with he gh5. Even dual record wouldn't mitigate this issue. Any thoughts?

In the end... Except paying this earoquartet company, are there other viable solutions?

Thanks