Same thing happened to my husband. He would either remember them or not at the moment he opened his eyes. now he almost always remember them, just not first ting in the morning. It take him a couple of hours to recall.
What made the difference in his case, I think, was that the two of us moved in together and his sleeping and waking up habits changed. Maybe it's the same for you - have you changed your job and have to wake up earlier \ later? did you change alarm clock that wake you up less sudden or let you sleep more? Are you sleeping in different hours?
I read an article about remembering dreams in general a while ago and
it said that in order to remember dreams it's better to wake up all at once and not drag in bed for a long time.