Constantly Loosing Cellular Connection on Spitz x3000

R03 includes regulatory fixes that somehow makes the performance unstable while R01 branch is the "generic" global firmware

R03 has better performance for me. I get much better upload speeds. So I guess it really depends on your tower,location and personal situation doesn't it?

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Most probably it's operator-related.
I upgraded to the once suggested RM520NGLAAR03A03M4G_01.201.01.201 and it was really a nightmare (disconnections, band aggregation problems) until I tried RM520NGLAAR03A04M4G_01.202.01.202 and that finally gave me stability again.
Now, out of curiosity, I tried RM520NGLAAR01A08M4G_01.205.01.205 and it's as stable as RM520NGLAAR03A04M4G_01.202.01.202 for me, go figure....

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I agree with this. I see a lot of variability between carriers such that there is not a single firmware that runs best in all scenarios. It takes some testing to see what works best for your situation.

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As @Max3 has stated, I think it is best to stick with either of the latest firmware visions only.
RM520NGLAAR01A08M4G_01.205.01.205 or RM520NGLAAR03A04M4G_01.202.01.202
They have been updated for a reason. As a side note, TMO has been doing a lot more testing with their 5G SA mode Country wide as of late so this in itself can be a major contributing factor for some users in certain areas.