Our Shure SLXD1 mics are garbage

I teach at a high school. New system bought by the county without our input. These units have multiple issues, ( inconsistent signal, very short battery life, just don’t work, very fragile) but what we believe is they were not designed for theater sized spaces or to work under the strenuous circumstances of a musical—singing, dancing, rapid blocking. Anybody else have a problem with this model of mic? Any suggestions about improving results? Thanks!