Motor goes out suddenly after 3 sec // now and then

Hi dear CRX friends… I’ve had my Honda CRX ED9 for 1 year and love it everywhere…. But since today he’s been having trouble with me… After work I’m getting used to my sled…. and driving fast to go shopping… He’s not going to a problem. But when I’ve done everything again in the car, he went out after about 3 secs…. the game repeated… about 5 times after a short wait 10 minutes…. he went off again problem on only problem was suddenly that he showed up in the 5 gear at about 80kmh ne speed of 3000 and came to me as if he wasn’t pulling properly… I hope you can give me advice because I’m not really an “auto mechanic” ….. but railwayman *g* and would like to make friends with the matter very slowly. Does any of you have any idea what it might be?? Please help me !!!