ARC D115 Mk2 vs ARC M300

Currently running two D115 Mk2s (passive bi-amping with ARC SP10 Mk2 pre). Am considering replacing the 115s with M300s. Having reliability problems with the 115s. Am I jumping out of the frying pan into the fire? The M300s are hybrids. Tried the SP11 (hybrid) and returned to the 10. Same with ARC hybrid tube amps? Comments and advice welcome. TIA