Is it possible that the decreased time speaking with people has caused you to lessen how much you utilize any speech techniques that you usually use? For example, slowing down when talking, drawing out certain sounds, using alternative words to avoid a block, etc. You may not use any techniques but people that do, tend to eventually make those techniques a subconscious action due to constantly having to talk. Granted, you said you still Skype and video call but that's not always the same as face to face. So it's possible that you've just gotten "rusty", in a way