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Reply To: [Solved] ProRes Log 4K 120fps Video Recording Dropping Frames on iOS 18.1: Diagnostic steps and permanent fix

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Home › Forums › iPhone & iOS Help Desk › [Solved] ProRes Log 4K 120fps Video Recording Dropping Frames on iOS 18.1: Diagnostic steps and permanent fix › Reply To: [Solved] ProRes Log 4K 120fps Video Recording Dropping Frames on iOS 18.1: Diagnostic steps and permanent fix

November 14, 2026 at 5:24 pm #8931
Nina Patel
Apple Master (Lvl 10)
Apple Recommended / Verified Community Solution
This canonical solution was verified and marked as solved in the Apple Support Community archive.

Formatting external drive as APFS or exFAT with 128KB clusters and using 10Gbps USB-C data cables.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

  1. Format the external SSD on a Mac as APFS for optimal sequential write consistency.
  2. Ensure cable is rated for 10Gbps or 20Gbps (USB 3.2 Gen 2×2); in-box white charging cables are USB 2.0 (40MB/s).
  3. Use drives with sustained non-SLC cache write capabilities (e.g. SanDisk Extreme Pro v2 or Crucial T700 enclosures).

Following this procedure restores full stability with zero recurring log errors.

Apple Certified Support Professional (ACSP)
Cupertino, CA | "Precision Apple Diagnostics"