The model from the first link misbehaves badly for me when orbiting or zooming. When it opens, I see an array of rectangular contours, with some non-rectangular objects as well, all apparently on a 2D plane, or nearly so.
I briefly caught a glimpse of some text as I zoomed in or out.
I’m guessing at one possibility is that some Label text has got detached from the item it was attached to, and ‘gone rogue’ (it has happened to me, and there are other posts on this forum about it). But I can’t find it. Nothing shows when I choose Model Info, Text, Select All. Even when I exploded everything, and turn all layers on, I can’t find any using Select All Leader Text, Select All Screen Text, or (in Dimensions) Select All Dimensions.
I tried a window select of everything visible, cut it, and pasted into a new model. It still misbehaves - perhaps the rogue text, if there is some, is included in a sub-group. After some zooming and orbiting, the model consistently jumps to a top down view, with just the top left quadrant around the origin showing a small corner (a few mm square) of what appears to be a reversed face showing from an unnamed group which is parent to a lot of other unnamed groups.
With Outliner set to Expand All, if I click on Zoom Selection for that group, I get to see the whole, also in top down view.
But if I Zoom Extents, I get back to the top down view of a small blue-gray quadrant.
When I tried Fix Problems at this point, I got a very long string of errors which includes multiple instances of vertices and edges with duplicated persistent IDs.
But when I reload the file, and try Fix Problems again, it says the aren’t any problems.
PS. There’s also the component Chris somewhere in the model, but you may have shrunk him to the point where he is invisible. I deleted him via Outliner but that makes no difference.
After I get the plan view of a tiny corner of one group, and zoom out slowly, I got to see some apparently unattacehd text again, and managed to select it (it is nested in a group) and progressively deleted it. But that still doesn’t stop the weird behaviour.
There’s something weirdly corrupted in the file. Sorry, I can’t help you further - I’m well out of my depth here.
Where did the file come from?