Sleeping user database queries causing problems


Hi, we are running our alexa skill with an external MySQL database on our own server.
We see different queries being spawned and causing the database to close the connection:

some examples (with shortened queries):

  1. “INSERT INTO user SET userId = 'amzn1.ask.account.AGJLOHE”
  2. “SELECT bin boot dev etc home initrd.img initrd.img.old”

Some of these queries are in sleep mode for more than 3 minutes. Is there any way to stop those queries? As the user table is all automatically I don’t know how to deal with it.
Thanks, Jan