Hi,
There's another thread on this subject:
https://www.pentaxuser.com/forum/ftopic242.html&highlight=555

I had exactly the same problems, but my "fix" is slightly dodgy.
Have a look at the other thread.

Hi,
I have experienced similar problems with my 555. Someone in our household had switched it off and the lens retracted but the cover remained open. When I tried to switch it on the start screen came on, the camera beeped and shut off. As an experiment I pressed the on button and the review button. The camera came on and I could review the pictures. I also found that pressing the menu button and the on button the software version is displayed.
By pressing various button combinations the camera turned on and the lens extended. When switching it off the lens retracted but not fully, it was about 1 mm proud. I gently pressed the lens surround ( very gently) there was a light click and the lens retracted about 1mm.
!!! I do not recommend that you do this!!!.
When switching the camera on the after this lens extended. Swtiching it off again and it retracted fully but the lens covers was open by about 3 mm. A gently tap on the side of the camera and the cover closed with about 1 mm gap.
I think that there is a mechanical weakness in this area. Ever since new the lens cover seemed reluctant to close. If it happens again it's going back.

Although this a digital thread, what's this news about Ilford in administation.
I hope they can continue producing some of the best quality film arround.