Print quality drops off at a certain height

I have been using my UpBox for 3 years and it has mostly been a great workhorse.
Lately it prints to a certain height and then drops in quality/precision.
I’m not sure but maybe the z axis is dropping steps?
Has anyone seen or experienced this before and any tips/fixes?

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You may check the springs under the platform( those for leveling), see if they are very loose.
Also try lubricate the Z axis leadscrew, you can reach by opening the back panel.


lubricate it with lithium grease?

We usually use silicone oil not sure if lithium oil works.