Sony issued a big firmware update for almost all of its current models of mirrorless camera, All these updates improves the overheating warning functionality of Sony cameras including other stability updates. Follow the link below for quick download…
A9: Sony Support
A7rII: Sony Support
A7sII: Sony Support
A7II: Sony Support
A6500: Sony Support
A6300: Sony Support
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So they aren’t addressing the overheating just fixing it so you won’t get a warning notice. Sweep the issue under the carpet. Well done.