Upgrade your Ultra Picokeyer to the latest firmware version. This is just the chip, not the complete kit. There is no need to return your old chip. Here's a log of changes made (and buigs fixed) since the Ultra-PK was introduced:
Fixed message record with sidetone OFF
Fixed letter spacing (L) = 1
Changed multi-press button scan timing to make it more reliable
Fixed auto letter spacing and multi-button interaction
Fixed sidetone during speed announcement, QSO decrement and tune mode
Improved paddle response during message transmission
Fixed message save issue that was truncating messages at 64 bytes, followed by a compiler bug that was corrupting longer messages.
Disabled BOR for power reduction, and to fix problems with chips resetting when buttons or paddles are pressed.
Fixed memory stacking (multiple buttons pressed)
Fixed message record backspace (8 dits) to leave the space after the previous word
Fixed use of multiple /Snn commands in a message
Fixed beacon delays > 25 seconds
Added QRSS mode
Added PTT output
"Relaxed" paddle timing during message record
Fixed short menu mode for MENU and MYCALL
Fixed paddle/straight key detect in all cases
Improved memory stacking button response. Messages can be stacked up to 4 deep.
Pressing the same memory button while a message is playing will terminate the message.
Added ~ 32 second timeout to setup menu