One conversation in iPhone messages gone

Its not the longest conversation but there are probably 30-50+ messages.
all i have is a text message that they sent me last night. I replied and saw just two hours ago that they read my message at 8 this morning. The rest of the conversation was there. Then i guess my phone started glitching up and it erased all the messages even the latest one that i sent and it only has the message before that.

also when i open my messages it takes longer than usual to open and sometimes exits out. When i open the conversation that got deleted except for one ; the last message they sent it takes like 10 seconds to open.

i feel like this has happened to me before but it recovered… How do i fix it though? I restarted my phone like 10 times and nothing worked.

Dude in my point of view your iPhone have a some hardware or software problems because in a text message will open easily, in a text message not attached any virus or other harmful content so please contact your iPhone authorized repair center. Other wise here i have share my website, it will show how to recover your deleted Notes from iPhone 5/4S/4/3GS Easily.