Just read this and thought useful for some who deal with Bangkok Bank

Bangkok bank told us that since 1 July, they require you to have the money in your account for 4 months (!!), before they can issue a letter that confirms proof of funds for various visas. And if you do not meet this 4 month requirement, they will lock the funds in your account for an additional 4 months, before you can access it; while giving you the right papers that you need for immigration (proof of funds for 2 months). Its not an immigration or visa requirement, but rather a banking requirement to deter money laundering and people using agents (that is what they told us)