A common trend for me: getting slower before I get faster. Is this a thing that happens with other runners?

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A common trend for me: getting slower before I get faster. Is this a thing that happens with other runners?
I haven't posted on this account for a while. I also have not seriously run for a while. Here's to getting back into the swing of things! (I listened to an audiobook for the first time while running and it was amazing. I highly recommend!)
Anybody on Nike+ running who wants to compete with me?
Monday's workout done!
Didn't think that I still had it in me.
It would be super awesome to have more friends on nikeplus to keep my motivation up. Feel free to add me! I'm under Marzipan Marko :)