Buggy A7SIII

[caelas17]

Someone please help me!!!!

Bug Report for Sony A7S III Firmware 4.0

Camera Model: Sony A7S III (ILCE-7SM3)
Serial Number: 4471075
Firmware Version: 4.00
Lenses Used:

• Zeiss 16–35mm f/4 (Lens firmware 0.02)

• Sony G Master 24–70mm f/2.8 II

Memory Cards Used:

• Sony V60 SDXC II (R 270 MB/s, W 120 MB/s)

• Lexar V60 SDXC II (R 270 MB/s, W 120 MB/s)

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Issues Experienced

1. Recording Stops Randomly

   • When recording in standard 25p XAVC S or 24p XAVC HS, recording stops unpredictably.

   • This occurs after only a few seconds or within the first minute.

   • Happens regardless of which V60 SDXC II card is used.

   • Camera is set to record to Slot 1 only, simultaneous recording disabled.

   • Auto Power OFF Temp set to High.

2. Mode Switching Bug

   • When switching to Movie Mode using the mode dial (including custom modes C1–C3), the camera often reverts to Photo Mode instead or cycles back and forth indefinitely until I take the battery out. 

   • This makes custom video setups unreliable and forces manual reconfiguration.

   • Issue occurs even after a full factory reset.

3. Straight Movie Mode Unstable

   • Even when not using C1–C3, simply switching to Movie Mode on the dial is unstable.

   • Recording sometimes stops after switching into this mode or it switches to photo mode (sometimes the  Auto photo mode gets enables with the i and green camera icon). This happens when the dial is nowhere near auto mode!

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Troubleshooting Already Attempted

• Full factory reset performed (issues persist).

• Multiple SDXC II V60 cards tested (Sony + Lexar, confirmed healthy and formatted in-camera).

• Tried both lenses listed above.

• Disabled simultaneous recording.

• Auto Power OFF Temp set to High.

• Verified that card write speed is not the bottleneck (recording mainly 25p).

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Expected Behavior

• Recording should continue reliably in 25p modes when using supported media.

• Switching to Movie Mode or using C1–C3 custom positions should not revert to Photo Mode.

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Actual Behavior

• Recording stops at random within seconds to a minute.

• Mode switching is unreliable and often jumps to Photo Mode.

• Occurs regardless of lens or media used.

• Problems have all occurred since upgrading from 2.11 (camera was incredibly stable on 2.11. Since 3.0-4.0 the camera has been unusable.

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Request

Please confirm if these are known issues in Firmware 4.0, and whether Sony can provide:

• A firmware hotfix or patch, or

• A service procedure to roll back to stable firmware (e.g., 2.11 or 3.01) until issues are resolved.