Domestic single zone thermostat

I am having issues with the furnace. I took the furnace out, tested all the components then crossed the thermostat wires and it fired right up. I put the unit back in hooked it up electrically. I adjusted the thermostat to desired temperature and it kicked on but shut down after about 30 seconds. I took the cover off the thermostat. I turn it off then back on readjusted the unit to desired temperature and it worked. I put the cover back on and it quit working. I took the cover back off and tried it again and it worked for 1 cycle. Now sometimes when I try to adjust it the heat display isn’t there. Now it’s not working at all except for the initial blower then kicks back off. I’ve done some searching and some say replace the whole thermostat and others say just replace the cover. I got a cover from another unit but it’s still not working. It’s only a year old and I’m not sure I want to replace it with the same thermostat after reading the reviews. What is a reasonable alternative to this thermostat.