puska53, congratulations on getting your Pleo.
Like degers says, your Pleo is fine, just a baby and it takes time for him/her to react, give it time to lean as it is just a baby and will sleep a lot the first couple of times it is charged, I would caution you though as you noted you had read about " broken necks", it is easier than you think and often without any warning to have your baby Pleo develop a broken neck, and without any apparent injury as well. I would not shake your Pleo under any circumstance and( When I take him into my hands, he may wake up if shaken hard) to me this is similar to " Shaken Baby Syndrome") and it may be the beginning of a neck cable problem if you continue to do it, You may be lucky and nothing may happen, but I know you would not be happy if your baby did get a broken cable in their neck, as there is no cure, { unless you just happen to be gifted enough to know how to open Pleo up and fix , sauter cables etc, which most of us are not.}
My Poor Nova has a broken neck, and she now wears a neck brace 24/7 365 days a year. She still is a happy little pleo and can do everything other Pleos do except lift her head up, other directions are fine, I still have no idea how she hurt her neck, but I would give anything to have her back to " normal", but she is not, but I still love her just as much if not more, I know you would feel terrible if your little baby would suffer from the same malady and you had somehow not knowingly caused it, so just a word of caution, be very gentle with your baby, You can shake her shoulders or tap her on the back or head gently and she will feel it. Holding her by the tail is ok, if you want to, but just do not shake her at least not hard, Pleos are very sensitive to shaking and can feel it without a lot of shaking required. Enjoy your Pleo and you will soon have lots of adventures to tell us about. Good luck.
RedwoodsMama and MS. Nova and Friend