I'd suggest as a minimum upgrading to MX 18.211.5.2 being the current Stable which we've been running on all our MX's including MX250 for past 5 weeks. OR take a punt and use the Stable release candidate MX 19.17.7.2 as in the screenshot where I've underlined for your reference. Thankfully last week we only had the issues with MX450 and MX250s and our MX67, and MX85 were unaffected.
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