The manufacturer has now issued an erratum acknowledging there is a frequency/error stability issue, they have not quantified the error just issued a poorly worded document.
The acknowledgement that the product has an inherent manufacturing/design defect means any UK or EU customer would have no difficulty in claiming against the retailer that sold them product.
If in year 5 of ownership you found the radio drifted too much to work properly listening to a signal you could issue a claim on the retailer to replace, repair or refund the product, you need to provide no more evidence than the erratum that acknowledged the defect.
In the UK it would cost £60 to issue a small claims court claim, the retailer will lose and the costs trying to defend it would be way more than replacing the product.
Retailers need to get a grip, some think they can wriggle out of their obligations with BS.
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So your in luck - wait to see if anything can be fixed with any updates and get a refund anytime between now and 5 odd years time if things are not sorted for you.
Good insurance cover from that regulation and your set no lose situation for you.