AV1 lossless recording vs HEVC vs Simple Mode lossless.

I noticed that the nvidia AV1 encoder has a recording in lossless option and have been comparing it to the nvidia hevc lossless mode and the native OBS simple mode lossless quality setting. It seems the AV1 file size is about 1/10th that of the hevc file, and the hevc is only slightly smaller in size to the simple mode lossless setting. However, I did notice while playing these files back within VLC player, that my AV1 recordings lock up occasionally. Is this a known issue, and are AV1 'lossless' recordings truly lossless and 1/10th the size of the others?! If so, I'm definitely recording in that format, if I can sort out what's locking up the footage.
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