bionic butt plug

recently bought said butt plug, used it once alone no issues there, used a second time with a guy, started to feel it not wanting to stay in and as expected upon orgasm it came flying out, used again a third time on my own again the exact same as the first time but it wont stay in for longer than a couple of moments, do i need to look for a bigger one or?!

anyone else got this plug? anyone any issues with it?!