Metro was running kind of slow tonight

I'm trying to figure out what was happening with Metro tonight. Normally, my transportation time from Bethesda is a lot less. Yes, I did make a detour to Union Station, to pick up a suit at Joseph A. Bank that had come back from the tailor, but after that, the timing was not great. I left Bethesda around 8:20 PM. I arrived at Union Station about 8:40ish. I went to Banks at Union Station, tried on the suit. It was perfect, and then I headed back to the Metro. Going back to Gallery Place, which would have meant not having to change trains outside in the cold weather meant a 20 minute wait. Going the other way to Fort Totten, meant a 6 minute wait. I opted for the Fort Totten option. However, once I got to Fort Totten, I had an 18 minute wait in the cold for the Green Line train to College Park. It would have been nice if the trains had been running more frequently.