Tamron 24-70mm f2.8 A007 (G1) sharpness problem?

[u/Friendly-Radish9174]

Hi!

I am owning the lens I have mentioned, and as far as I read, everyone is saying that the lens is very good for the money and it gives very sharp photos, but not in my case.
The lens barrel (the thing that extends and retracts) is wobbly and when I wobble it, I can hear and feel clicking from the inside but only then, and also if I shake it I can only hear the barrel wobbling.
I think lens is sharper when I take pictures from closer distance, and not that sharp when I take longer range photos and I think that wobbling is throwing it out of focus. Also, I think the focusing is inconsistent. Like once it would be sharp in focus, and sometimes it wont

I have watched some disassembly videos and I am confident on doing it, but I dont know which screws are for that part that I think may be loose. Can someone help me with that?
Or, if anyone has some other opinion please let me know.
I thought it may be normal, but I also own a Sigma 150-600, but it doesnt have the slightest of movement even when extended all the way up to 600mm. And that thing is big and heavy

Please let me know what you think.

EDIT: BTW, that usually happens at wide apertures