Today (19/06/2019), something happened that has happened a couple of times before. Where I am walking or something and then I "twitch". Best I can do to explain it is like this: the first one was where I thought I heard my phone ringing and as I glanced around it felt as though my muscles spasmed in my upper body (neck and arms). The second happened no more than 10 minutes later where I was walking and it felt like I stepped and almost immediately froze and stepped simultaneously. As though my brain didn't process it.
I've had similar things happen before but I just put it down as "twitching" / muscle spasms. Do I need to worry about this?