Hi,
yes a slower feed rate is a possible, in fact sometimes may be the only solution.

What you need to do is confirm that is what is happening. There is no point in applying what you think maybe a solution until you have conclusively proved a fault.

If you run some code , say one panel, and we'll assume the fault has occurred the at the end hit <Return to Work Zero>. Does the machine return to the start point exactly?
If it does not then we know that somehow the steppers are gaining/losing steps. If that is the case, and seems highly likely then we need to devise an experiment to determine whether
its electrical noise causing random gain/loss of steps or whether its the steppers themselves. This is not that easy.

In the first instance try running the same code but with the tool running above and clear of the material. If the fault goes away we at least know its when the machine is under load, due to
either electrical noise from the spindle or the extra cutting forces. Another experiment is to run the code but at a much reduced, say 1/4 feed rate. Does the fault recur? If not that is an indication that its the cutting
forces that occur at speed that seem to cause the problem.

What steppers and what voltage drivers/supply do you have?

Craig