Hey guys, one of my employees has really, really been sucking it up lately. Their performance has consistently dropped over the course of several weeks and it doesn't look like it's going to get any better. Their deficiencies have been pointed out repeatedly, but they refuse to change/alter the way they perform their job. This has caused a toxic work environment in the office because other people's jobs are being impacted. Should I let this individual go, and appoint someone else in the department (that has experience in the role) to take over while a suitable replacement is found? Or, just let the individual keep working through the end of the year and hope things will change? Thanks for your help!