OTA Plug-in failing to issue updates for firmware

[ignidis]

I'm using a RASPBEE to control my ZIGBEE Network, the FW of the RaspBee is 26400500, Gateway Version is 2.26.3 ... I use the PHOSCON PWA WEB GUI to do all operations ... A couple of days ago i activated the OTAU functionality and after loading the IKEA current updated files i got some of my 1000lm bulbs updated, phoscon shows the new fw version on these ...
Then i uploaded philips and osram firmwares, rebooted the gw, checked that the OTA plugin had created their zigbee files and waited for something to happen ...

Since, no other device got updated, regardless of notifications that show firmware available, or even sometimes the system sending a new firmware to a device.

I have restarted the Gateway several times , deleted and downloaded the firmware, checked that the OTAU plugin is generating their zigbee files out of the ota files, but since two days i can only see the log showing "OTAU_NO_IMAGE_AVAILABLE", even the system showing files are there ... example of one transaction

15:35:02:232 OTAU: received QUERY_NEXT_IMAGE_NOTIFY
15:35:07:379 OTAU: query next img req: 0x001788010863620F mfCode: 0x100B, img type: 0x010D, sw version: 0x420049E0
15:35:07:385 OTAU: Match otau version 0x42006BB7 image type 0x010D
15:35:07:387 OTAU: /home/deconz/otau/100B-010D-42006BB7.zigbee: 240760 bytes
15:35:07:387 OTAU: offset 0: ota header (56 bytes)
15:35:07:388 OTAU: offset 56: tag 0x002A, length 0x66000D01 (240704 bytes)
15:35:07:388 OTAU: found update file /home/deconz/otau/100B-010D-42006BB7.zigbee
15:35:07:389 OTAU: send query next image response: OTAU_NO_IMAGE_AVAILABLE

This event repeats after several hours, but for most of the time i have just the short no image found event
An interesting evenet is th4 example down here, please see the timestamps ... it is the same device Querying two times, once a file is found, no image is returned, the next time not even the file found is reported ...

14:26:44:313 OTAU: query next img req: 0x90FD9FFFFEFB83DB mfCode: 0x117C, img type: 0x11C4, sw version: 0x12214572
14:26:44:319 OTAU: Match otau version 0x24040005 image type 0x11C4
14:26:44:320 OTAU: /home/deconz/otau/117C-11C4-24040005.zigbee: 215316 bytes
14:26:44:321 OTAU: offset 488: ota header (56 bytes)
14:26:44:321 OTAU: offset 544: tag 0x0000, length 0x00031900 (203014 bytes)
14:26:44:321 OTAU: offset 203558: tag 0xFFBF, length 0x00000040 (70 bytes)
14:26:44:321 OTAU: offset 203628: tag 0xFFBE, length 0x00002BA2 (11176 bytes)
14:26:44:321 OTAU: offset 214804: tag 0x6D2F, length 0x337D7824 (512 bytes)
14:26:44:321 OTAU: found update file /home/deconz/otau/117C-11C4-24040005.zigbee
14:26:44:323 OTAU: send query next image response: OTAU_NO_IMAGE_AVAILABLE

14:58:28:995 OTAU: received QUERY_NEXT_IMAGE_NOTIFY
14:58:53:811 OTAU: query next img req: 0x90FD9FFFFEFB83DB mfCode: 0x117C, img type: 0x11C4, sw version: 0x12214572
14:58:53:811 OTAU: send query next image response: OTAU_NO_IMAGE_AVAILABLE

Seems the file match and retrieval function has some quirks ...
I'm seeing this behavior for ALL vendors and files

Rebooting the GW does not help, neither powering off and on the remote devices (lights)

Any suggestions ?
Thank you in advance for your feedback