iMac 5k sleep issue after ssd upgrade

Hi I just upgraded my imac's internal hdd to a crucial mx300 750 gb ssd . Before i made the switch I copied all data and made a time machine backup and performed a successful surgery to replace the hdd . Booted up perfectly BUT every time my imac sleeps it either indicates a kernel error or just has a blank screen, and when i go to internet recovery, my drive was always unmounted or erased when i entered disk utility . I have to go through the time machine backup process every freakin time it goes to sleep . Anyone know what this is or how to fix it? Google isnt helping much . Thx

Just now it randomly crashed and did the same thing while i was using it so i dont think its just when it sleeps...

And again i was using it and it just randomly crashed my open programs and froze . Parts of the screen dissappeared, like the dock and task bar and the rainbow loading wheel just kept going . This is really annoying if anyone can help id really appreciate it .

Is there a chance that its the sata cable? Im not sure if my imac has a sata 3(6gb/s) or a 2(3gb/s). Google wont give me an answer and i cant look in my system report right now cuz it shut down but im like 90% sure its a sata III