Apple has today released iOS 15.3.1 and iPadOS 15.3.1.
Apple’s release notes say: “iOS 15.3.1 provides important security updates for your iPhone and fixes an issue that may cause Braille displays to stop responding.”
We've not had an opportunity to test these updates ahead of today's release, so do not know for sure if they do indeed resolve the bug which could Randomly have, VoiceOver announcements cause both a braille display and iOS to freeze. Accordingly, please post a comment below if you are able to confirm this bug as resolved.
As these appear to be minor updates, our expectation is that they do not contain any additional accessibility changes for blind and low vision users; however, if you notice any changes, improvements or regressions in your own use of the software, please post a comment below with your findings.
iOS 15.3.1 and iPadOs 15.3.1 are available via Over-the-Air Update (Settings > General > Software Update) via Finder on a Mac with macOS Catalina or later, or via iTunes on a PC or Mac with macOS Mojave or earlier.
Before updating, we strongly recommend making a full and complete backup of your device (either locally or in iCloud, depending on personal preference). This will ensure that, in the unlikely event that something goes wrong during the update process, you will have a current backup on hand in case a device restore becomes necessary. Also, if using OTA update, we recommend plugging your device into a power source for the duration of the download/installation process, so as to prevent the unlikely event of your battery going dead during the update.
More information on how to update the software on your device is available on this Apple Support page.