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Siri has stopped speaking. It was working as expected and still does wat’s asked but no speech. Help please! IOs 17.03

A small, 20 second video on my website is running into problems which seem inconsistent in the iOS environment. These are the test results:- iPhone with iOS 13.6 - YES it runs iPad with iOS 9.3.6 - YES it runs (iPad too old to be updated further) iPad Mini with iOS 13.6 - NO on any browser iMac with iOS 10.15.6 - Safari NO; Chrome YES Firefox YES Here is the code from my web page:- <div class="embed-responsive embed-responsive-4by3"> 				<video class="video-background" controls="true" controlsList="nodownload" playsinline> 						<source src="videos/logoVid265.mp4" type="video/mp4"> 						<source src="videos/logoVid.webm" type='video/webm;codecs="vp8, vorbis"'> 						Your browser does not support the video tag. 				</video> </div> The .mp4 is H.265 encoded but I've also tried H.264 encoding with the same result. I've searched every technical forum I can find and not been able to find a solution. The video works perfectly on any other O/S (Windows; Android; Amazon Fire; etc). Most threads relating to similar problems are years out of date. I'd be extremely grateful if anyone can shine a light here. TIA.