Issue with Liitokala lii-m4

Hi to everyone. Help me guys if any of you had the same issue or if you have any ideas what is the cause.
I own above mentioned charger from July this year. Everything was working perfect untill 2 days ago, it suddenly stopped detecting 14500 cels, just says “null”. Tried several of them, old ones, new ones, nothing. Everything else is working fine. 18650`s, Nimh, AA, AAA. power bank function.

Have a pleasant time at this friendly forum, Raven1!

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