You lose the thread of your argument.

你们的论点有失条理.

youdao

Now my concentration often starts to drift after two or three pages. I get fidgety, lose the thread, begin looking for something else to do.

而今，我常常是翻上两三页书注意力就开始溜号，坐立不安，思维中断，进而想找点别的事情做做。

youdao

I get fidgety, lose the thread, begin looking for something else to do.

我很烦躁，失去了思路，并且开始寻找其他的事做。

youdao

Regrettably, Collison cannot resist the temptation to editorialize about Indonesian politics and sometimes seems to lose the thread of the narrative as he pursues various sidetracks.

CNN: Hot Buttons