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A sudden increase in the rate at which material reaches the most internalpart of an accretion disk, i.e. the boundary layer, can change its structuredramatically. We have witnessed such change for the first time in the symbioticrecurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Alert Telescope(BAT)/ X-Ray Telescope (XRT) / UltraViolet Optical Telescope (UVOT) andAmerican Association of Variable Stars Observers (AAVSO) V and B-band dataindicates that during an optical brightening event that started in early 2014($\Delta$ V$\approx$1.5): (i) the hard X-ray emission as seen with BAT almostvanished; (ii) the XRT X-ray flux decreased significantly while the opticalflux remained high; (iii) the UV flux increased by at least a factor of 40 overthe quiescent value; and (iv) the X-ray spectrum became much softer and abright, new, blackbody-like component appeared. We suggest that the opticalbrightening event, which could be a similar event to that observed about 8years before the most recent thermonuclear outburst in 1946, is due to a diskinstability

Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis