Weird issue: Button Texts go missing

Hi guys,

I have a very weird issue. The I start up node red by rebooting my Raspi, everything works fine and the buttons, which get their text from the node before display them.
But after some time (minutes), the texts go missing...
After pressing buttons onebyone, the text appears again...
This is new, but I can't say if it was introduced with an update...I just noticed and it was working fine until recently.
Please see screenshots and a flow example attached:

[{"id":"b4fdc219.0d7f78","type":"ui_toast","z":"4a50a157.a32fa8","position":"dialog","displayTime":"3","highlight":"","outputs":1,"ok":"Yes","cancel":"No","topic":"","name":"","x":910,"y":100,"wires":[["2c902897.a80868"]],"icon":"node-red/light.png"},{"id":"d8ae6754.4a4ab8","type":"ui_template","z":"4a50a157.a32fa8","group":"582f9d1f.bc00bc","name":"Drucker_Arbeitszimmer","order":4,"width":"12","height":"2","format":"<md-button\n class=\"vibrate filled bigfont\"\n ng-style=\"{background: !msg.actState ? 'gray' : 'green' }\"\n ng-bind = \"msg.name\"\n ng-click=\"msg.topic = ''; msg.payload = msg.notification;send(msg)\"\n>\n</md-button>","storeOutMessages":false,"fwdInMessages":false,"templateScope":"local","x":710,"y":100,"wires":[["b4fdc219.0d7f78"]]},{"id":"e526be6f.68013","type":"function","z":"4a50a157.a32fa8","name":"Save states; Create Noti","func":"msg.actState = msg.payload;\nmsg.name = msg.topic;\nmsg.notification = (msg.payload === true ? (msg.topic + ' ausschalten?') : (msg.topic + ' einschalten?'));\nreturn msg;","outputs":1,"noerr":0,"x":470,"y":100,"wires":[["d8ae6754.4a4ab8"]]},{"id":"2c902897.a80868","type":"function","z":"4a50a157.a32fa8","name":"convert output based on actState","func":"msg.payload = (msg.payload == \"Yes\") ? !msg.actState : msg.actState;\nreturn msg;","outputs":1,"noerr":0,"x":1140,"y":100,"wires":[["ee410521.d82c4"]]},{"id":"8013e21e.6ca1c8","type":"ADS Notification","z":"4a50a157.a32fa8","name":"","datasource":"6052e4.0430bd1c","varName":"Arbeitszimmer_ST.L8_1","varTyp":"BOOL","varSize":"","timezone":"UNCHANGED","transmissionMode":"ONCHANGE","maxDelay":0,"cycleTime":10,"property":"payload","topic":"Drucker","x":120,"y":100,"wires":[["e526be6f.68013"]]},{"id":"ee410521.d82c4","type":"ADS Output","z":"4a50a157.a32fa8","name":"","datasource":"6052e4.0430bd1c","varName":"Arbeitszimmer_ST.L8_1","varTyp":"BOOL","outValue":"payload","varSize":"","timezone":"UNCHANGED","topic":"","x":1410,"y":100,"wires":[]},{"id":"582f9d1f.bc00bc","type":"ui_group","z":"","name":"Hardware","tab":"9349b26f.4ead88","order":1,"disp":false,"width":"12","collapse":false},{"id":"6052e4.0430bd1c","type":"ads-connection","z":"","host":"192.168.1.2","amsNetIdTarget":"5.12.1.1.1.1","amsNetIdSource":"192.168.1.1.1.1","port":"48898","amsPortSource":"32905","amsPortTarget":"801","adsTimeout":"500"},{"id":"9349b26f.4ead88","type":"ui_tab","z":"","name":"Utilities","icon":"dashboard","order":7}]

Yes - was a regression (bug) that I caused in recent version - Now re-fixed in latest. (so you'll need to upgrade again and flush browser etc)

Thank you!
I am up to date via palette...
Which version(s) do I need?

either (older) 2.14.0 or new 2.15.3

just installed 2.15.3
working again
thank you