Warping on the bottom is something I know a lot about. Are you printing on a heated bed with kapton? What temperature? You really need > 100C. I recommend around 105C or 110C (I mean the ACTUAL temperature measured by probe should probably say 105C so 110C is probably your goal temp).
You also want to enclose your printer if possible and get the air temp up to around 35C. Also you need to use "ABS glue".
Why ABS? Some people think ABS is better than PLA. It isn't. It's a very difficult material with properties that aren't all that impressive. If you need high heat sensitivity (if it has to withstand temps that kill people which many parts do) then there are better options (e.g. nGen). Here is a table with some material properties (strength, flexibility, temperature):
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gr5 2,224
This is incredibly common. It's pretty much always caused by a slipping belt. I'd have to see your printer in person I think but basically the problem is that a set screw on one of the pulleys is loose. That's what causes this on most printers. I don't even know if your printer has belts.
That this happens in cura and not another slicer is not a major surprise. This kind of thing happens only on extra high acceleration and a combination of factors and features (bugs?) in Marlin can cause higher acceleration (Marlin has a max acceleration and then a MAX acceleration, lol - the lower max acceleration is rarely violated and the higher one is never violated).
cura 15.* is a great slicer - I do not recommend you go to version 3.* unless there is a specific feature you really need in there.
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