OK, well I've bored you all with ds1's daytime wetting problems before. He is 4.3 and for the last 4 months or so we have had huge problems with daytime accidents - nearly every day. He wasn't late with potty training btw - out of nappies at 2.5 and whilst never totally reliable, this time last year he was fantastic compared with now - maybe one accident every few weeks. I certainly didn't have to worry about it constantly and carry spares around at all times like I do now 
We are currently back on a simple star chart. OVer the last two weeks we've had only 2 stars for daytime dryness (but about 5 for night time dryness - he's still in a pullup btw), despite going back to fairly frequent prompting.
Today, for example, he was dry when I picked him up from nursery at 3.15 (cue much praise). I prompted him to go then; he went by himself at about 4 and 5pm; I prompted him to go before tea at 6pm; and by 6.45 he had wet pants 
I'm at a complete loss. I know no-one's going to have any bright ideas but I just wanted to vent my frustration.