It can be straining on your printer to frequently change black inks, so it's best if you can try to group your matte and glossy printing together to reduce the number of times you switch.
I always do the black ink change at the printer, wait a few minutes, then do a nozzle check and make sure everything looks good before I start printing.
If this wasn't happening before and started recently, then here are a few thoughts: it may related to the age/condition of your PK damper, or could be your printer changing with age, or older carts can not have as good of ink flow (due to particle build up on the exit filter, drying in the air vent channel, worn out exit valve, etc... that could cause essentially ink starvation when doing cleaning cycles, etc... but still provide good ink flow for regular printing), or possibly temperature/humidity related?
I hope this helps, please keep me posted and let me know if there's anything else I can help you with.
Best regards and happy printing~ Dana