I have a problem with Powerconnect 6248, which appeared recently. Time from time CPU for ipMapForwardingTask rises up to 30-40% instead of normal operation (average 6%) and PINGs to switch raises from 1ms to 50-100ms. Logs show nothing. It last from several dozens seconds to minutes. Then it goes back to its normal stage, but after few hours (or less) repeats again. What could be the reason? Current FW 3.3.1.10