Correção de frases: In use, etc

Boa tarde a Todos!

Como corrigir as frases abaixo:

- we had some problems IN USE this.

- because IT'S MORE efficient choice...

- the only solution was EVERY DAY WE UNPLUG IT

Obrigado.
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Here my stab at it, my answers are the "quoted ones":

We had some problems in using this.

Some would deem "we had some problems using this" a better choice of words, to me it depends on context.

Because it´s a more efficient choice..
.

The only solution was EVERY DAY WE UNPLUG IT
The only solution was to unplug it every day.