In most cases you should not see a lock up of the POWERbreathe K-Series device, however in some rare instances communications between the Breathe-Link® software and POWERbreathe K-Series may be corrupted by abusive behaviour of these buttons. Therefore when adjusting the training load using the up and down buttons you should increase and decrease the values slowly and in a positive fashion, a 1 second pause for each click of the adjustment buttons. POWERbreathe International Ltd views any behaviour beyond the one described above as unexpected abusive behaviour.