Anyone tech savvy please, headphone problems

I bought a new headphones by the brand Sony and they worked great but all of a sudden after using them only a few times they wont work with my Samsung phone. My phone can sense the headphones still as if im playing music and I plug them in the music pauses and vice versa but the music still keeps playing out of the speakers when I push play. Its not my music app as its the same with youtube. My phone will play the music through my headphones if I push the cable in with a lot of force into the phone and hold it in like that but as soon as I let go it plays through the speakers again. So it works if I push my cable really hard into the outlet. Why ? Is there something wrong with phone sensor inside the phone I dont know how outlets in phones work but something is damaged ? The headphones work perfectly with my laptop but it really doesnt matter because I bought them so I can listen to music outside. Inside I prefer speakers. -Sigh-
My phone is a little old for a smartphone. I bought it autumn 2018. It crashed in spring 2019 already and has crashed twice more but it works well just not the best ever model I guess but there was never any issue with my old headphones which were Urban Ears.