Big issues with Klonopin, can't remember anything what happend.

Basically due to my anxiety/panic attacks I have been prescribed Klonopin for years. I was prescribed a small amount, .5 mg 3 times a day. For the past year or two I stopped taking it regularly because I felt that I started to gain control over my anxiety. I remember it would make me feel very sleepy, but I could function normally. I take it only in extreme cases of anxiety, once every few months.

Today I asked my girlfriend if she would go see the Conjuring 2 with me. She told me we already saw it together a week ago, and now I'm concerned. She showed me the tickets and told me I was definitely awake for the whole movie. I remember going to her house to hangout, feeling very anxious and taking 1 klonopin pill (.5 mg) and then I vaguely remember her asking me if I was feeling okay enough to go to the movies. I don't remember anything after that. I don't remember seeing the movie at all. I've watched the trailer a few times now and don't have any recollection of the scenes. I don't remember how the rest of the day went and I don't remember going to sleep. I remember one other time this happened when I took Klonopin before a concert, the next day I didn't remember going to the concert or going out to eat afterwards.

I know there aren't doctors on here, but my psychiatrist died recently (old as fuck) and so I'm hoping there are people here who have taken Klonopin for medical or recreational reasons, or are familiar enough with the drug to give me some insight.

Is it possible that I experienced a small high? Has anyone else experienced memory loss from this? Why would I be able to take it 3 times a day before but then take it once now and experience memory loss, can my tolerance change?

Thanks <3

tldr; Took .5 mg of Klonopin for anxiety, went to the movies, don't remember any of it. is this normal