Help please !

My kitchen floor has a linoleum covering and is about 6 years old. Recently it has lifted in small "bubbles" near, but not immediately next to the junction with the kitchen units. (The lino extends underneath the units but not fully to the back wall). On a couple of the "bubbles", the surface has clearly been broken, although no-one, including my teenage sons, can tell me why. (I did suspect cigarette burns, but I have been assured not). One of the holes is leaking a grey/white-ish liquid... not a lot, but say 1/4 teaspoonful, every day. I suspect that the concrete below has de-stabilised.

a) What is the likely cause of what is happening and why has it suddenly started happening ?

b) Have I any repair options ?

c) If I replaced or repaired with more lino, what is to stop the problem re-occurring ?

Many thanks
Rosie

You are not going to be able to make a nice repair but it could be patched if you have a spare piece left from the installation. Most people don't save old pieces so the patch idea is probably not going to work. If there is any liquid under the tile you are going to need to remove your linoleum and find out what is going on with the concrete. That grey liquid might be your old adhesive deteriorating.

Bubbles Are Caused By Air, Under The Floor, To Fix A Bubble You Can Make A Small Hole With A Surige And Squirt Some Glue Into The Bubble And Lay Something Flat That Has Some Weight To It Till It Sets.
Did You Put 1/4 Ply Wood Down Before The Floor Was Laid, Was The Floor Laid On An Old Floor? Hope This Helps , Nichols Trim