RX2 Keyboard slow after last firmware update

Since updating my RX2 with the latest firmware, the keyboard has become slow or non-responsive at times. It makes no difference whether I use a different USB drive. Currently using a Sandisk Extreme Pro 256 gb SSD and Supersonic Rage 2 128GB USB. Both are formatted to FAT32 and have 10,000 tracks on each. Never had a problem prior to the latest update.