trickle ghosting 

Unlike ghosting where your love interest disappears completely, trickle ghosters do not disappear completely, they just slow down communication to ... a trickle. Trickle ghosters will communicate/message a bit and then disappear again for several more days.

I haven't heard from Carter in days, I think he may be trickle ghosting me but I know I will see and hear from him again

trickle ghosting by Ginandjizz August 1, 2019