I had this problem with another brand of coolant once. But, you should check the concentration with a refractometer to be sure it is correct. A lathe is bad, IMO, for evaporating the water out of the coolant, and so the concentration can increase over time. The top up solution should usually be weaker than the original mix for this reason.
So begin with the concentrate a little extra dilute, rather than extra concentrated.
You might have to wash down the inside of the lathe and the carriage regularly with coolant in order to dissolve the buildup on areas that are only getting a bit of splash now and then.
Also, use a skimmer to keep the oil out of circulation, as an oily sludge can also make a sticky mess when rebroadcast all over the cabinet.
Or, try a different brand, but the same principles apply.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)