Vision's weakened state is directly attributed to the severe damage he sustained during an ambush by Corvus Glaive.
Here's a breakdown:
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The Ambush: Corvus Glaive and Proxima Midnight attacked Vision and Scarlet Witch in Scotland. Their primary goal was to extract the Mind Stone embedded in Vision's forehead.
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The Damage: While Captain America and his team intervened and prevented the extraction of the Mind Stone during that encounter, Corvus Glaive inflicted significant damage on Vision in the process. This damage weakened him considerably.
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Impact on Abilities: This damage is why he appears weaker in later appearances before his death. The attack impacted his ability to function at his full potential.
In short, Vision's weakened state stems from the critical damage he suffered from Corvus Glaive's attack while attempting to retrieve the Mind Stone.
