Rainbow Germanium defective – cause???

Hi, I got myself a Rainbow Germanium some time ago. For about 1 month it ran perfectly. After that a TMT broke. I then sent it to Rainbow and they thought that it was overloaded, the swing coil has gone through. So I was allowed to pay for a new one, because “self-indeed”. All right. I got the new one then and built it in. Now it’s over about 1 month and look here, the TMT suddenly refused to serve again yesterday evening. TMT is connected to the test. the funkt. So the TMT is through again. The funny thing was yesterday, when he never wanted to smell nothing burned, only when I am off again tomorrow. What can it be that it smokes? If I had overloaded the speakers, they would distort, wouldn’t they???? I now have my old MB Quart ?QS 160? back in and with them I have no problems. Besides, I find that the Rainbows are clearly sad than the Quarts. The LS are attached to a Xetec. P4 EVO Partially active via the crossovers. Does anyone have any advice? MfG SWR3ELCH