I worked for a company a few years ago, All of a sudden a customer who had previously bought very little from us started to buy a lot,You'd find that alot with in the restaurant industry where they know they are going under and trade until after Christmas to get the cash in and go belly up then owing the suppliers... shitty practise indeed
obviously on account, Our company were suspicious and sure enough it was a case of them burning their bridges with other suppliers,
Luckily our crowd put a block on the account before much damage was done,