Never happens for me. I’ve pretty much switched over to HMV from Zavvi for about 6/7 months now (just use Zavvi on the odd exclusive or price drop etc) and if I order a normal instock item from HMV it arrives rapidly and pretty much a day or 2 after ordering. But majority of my pre orders are dispatched on a Friday specifically for delivery on Monday release dates. And vinyl too, my vinyl pre orders always arrive for Friday release dates.
I did love that most my Zavvi pre orders would arrive on a Friday or Saturday. No biggie, just something I’ve noticed between them