>And it seems to happen more often than not.
People don't come on the internet to specifically post about what a stress-free purchase they had. They come to whinge.
I've been keeping an eye on articles regarding gazundering that hit my inbox (I'm boring enough to get daily market emails) and I'm of the opinion that the companies who publish these 'surveys' have a vested interest in making the normal house buying process look terrifying, i.e. companies who auction off houses are doing 'research', and after quickly putting it into google just now, the first article I came across was a law firm who also specialise in person injury claims. Not on the top of my list of reputable firms.
The trouble is, press copy and paste articles that claim to be research without fact checking them or looking at what overall actual percentages across the market are. It breeds fear. I wouldn't let it worry you to the point of crippling anxiety.
I would:
NOT sell to a cash buyer; these are the worst for gazundering
NOT sell to anyone who is not completely invested in both the house and the area; anyone who might be on the fence, apathetic about your home and therefore might be liable to have a wobble should be avoided at all costs
I would:
Get my EA to financial qualify prospective buyers and make sure they can comfortably afford to buy your home (without, at the same time, trying to flog them their own financial services, which is on the rise).
Make sure you know your home's true worth. Even if you get 3 EAs in they'll all be trying to get your business and may ALL overvalue it. You can actually pay to get an RICS qualified person in to value your home independently, but you have to pay. Last time I looked it was about £320 for a 300-350k home.
Give priority to those in the shortest chains; FTBs living at home, people who moved into rentals after selling their house, that sort of thing.
Listen to any bad gut reactions you have about buyers - but this would involve meeting them.
FWIW we have no idea when our purchase is likely to complete; it could be October, January, or if their house purchase falls through, it could be summer next year. We know this, and we've no intention of dropping our asking price because we're fully committed to THIS house and THESE sellers, who are very, very good people.