reporting an electronic problem.

[Guto]

Hi All,

Could you help me with this, please?

I was using an electronic equipment the other day and it was not working properly while I was operating it.
Now, I have to send it to fixed but I'm not sure how I can report this issue to a technician.

here we go...

When I was using the device on saturday it worked fine, but unfortunately it showed some problems on sunday.

Is it correct?
Can I use the verb "show" to report it?

How would you do it?

Thank you in advance for your attention.

Brazie :)

[Mister Micawber]

I have answered this for you on another website.

State precisely what the problem was:

When I was using the device on Saturday it worked fine, but unfortunately it [ began shaking / emitted sparks / shorted out / ate my cat] on Sunday.
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Native English teacher at Mister Micawber's