Lose (one's) grip on (someone or something) American British phrasal verb
1. To lose a firm grasp on someone or something with hand
Marry lost her grip on the horse and then fell into a pond nearby.
Hang in there! Just a more 2 inches you will reach the mountain top. Don't lose your grip on the rope.
2. To lose a clear understanding of something
He loses his grip on technical problem, so he makes everything messy.
I feel like losing my grip on this situation, I can not settle this tense argue.
The verb "lose" should be conjugated according to its tense.