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I haven't had that problem here, but can suggest some stuff which might possibly work...
If your slicer has some option like "ignore small Z gaps" (the Cura name, but I'd imagine others have something similar), make sure that's turned off. Basically the option tells it to not top/bottom skin small gaps like the ones between bricks, and can cause problems like that.
If it's not that, it might help having it run the cooling fan a bit faster (either all the time, or bridging, whichever your slicer thinks it's doing at the time), or maybe higher infill percentage.
Hope some of that helps.