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[nRF52 DK] PC does not recognize USB device anymore - LD5 fast blinking

HW: nRF52832 DK, PCA10040 V1.1.0, 2016.23

SDK: nRF5_SDK_15.2.0_9412b96

IDE: Eclipse configured according to https://devzone.nordicsemi.com/tutorials/b/getting-started/posts/development-with-gcc-and-eclipse

SoftDevice: ble_app_bps/pca10040/s132/armgcc

PC: Windows 8.1

nrfjprog version: 9.8.1

JLinkARM.dll version: 6.40

GNU Make 4.2.1 (Built for x86_64-w64-mingw32)

Issue description: after a couple of successful flashes from Eclipse using make, without any configuration changes the board stopped responding. LD5 on the board is blinking very fast. No J-Link devices can be seen in the Windows Device Manager (actually there's not even the category "Ports"), nor using the SEGGER J-Link Configurator:

I have also tried to boot into the "bootloader mode" but it does not change the situation - nothing can be seen on PC.

Does this mean that I need to arrange funeral to my poor Development Kit, or is there still some light at the end of the tunnel?

Thanks!

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