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Does any of you have an idea why would Bambusa vulgaris (most likely) start loosing branches. Whole sets of branches from the node break off by themself or when you just pull lightly one of the branches. I guess that can't be normal, or is it? Most of the branches also have soome aerial roots forming at the base.

Pretty strange, my Bambusa seem to have very tough branches, I don't have B vulgaris but in general it seems Bambusa branches get crazy long, one much larger than the others and quite stiff. I think that B vulgaris roots easily from branch cuttings, sounds like yours is making it's own air layer!

That's what came to my mind as well. Some sort of propagation method. Large and heavy branches fall off, they already have new shoots and roots set up, if that falls into a moist undergrowth, rooting could be instant. It pushed out a shoot recently, so it could be triggered by that as well. Some time ago, it had lost a lot of leaves and the remaining foliage was brown and partly damaged. I haven't seen it when it happened, but there must have been something wrong. It's quite large though. 10cm diameter culms, perhaps more, never checked really.

Ps: branches are tough, but not the tissue where they are attached to the node. When it breaks, it doesn't seem too hard or strong. I'll snap a photo

Mine have been tough to cut using my best pruners where they join the culm, very fibrous and hard. I don't ever recall any of the B vulgaris Vittata in Hawai'i having the branch thing like you describe.

The attachment to culm seemed rock solid and tough(impossible) to remove when I had vulgaris in Hawaii.